No worries there zcat. I’ve had mine down at about 100mph (on th Autobahn, obviously) and no worries about it flapping about or anything.
I use my tonneau if I’m travelling quite a distance or if it’s a nice sunny day and I know the roof will be down all day 
On the motorway is does stop the roof bobbing up and down. The main thing it will do is stop the inside of the roof fading. The inside of my roof was a beige colour but is now back to black thanks to Renovo 
it was a messy, fiddly job but it looks fab again now 
I also think the car looks nicer with the tonneau cover on
In the week and a bit I have been driving my MX5 the top has only been up ONCE and that was because it was raining! I do get some odd looks at 7.00 in the morning on the way to work - but I must be the only person who turns up for work - especially on a Monday - with a big grin.
I turned up at work with a big grin. I used a motorcycle.
Dunno how you convertible types can live with being so constrained in half a metal box. Nasty doors and windscreen numbing you from the experience of travelling.
Could be we just hate picking flies from between our teeth.
Full face helmet fixes that.
If you’re going to take cheap shots then the one about how bikes fall over when they stop is much better. True as well.
It turns out everything is a compromise between freedom and security.
Not such a big grin when it is raining out.
Motorbikes kind of look like fun but it’s the bit where they fall over when they’re moving very fast that puts me off.
I know someone that races bikes and having come off on the circuit and realised just how much it hurts hitting straw bales at 100+ mph decided he didn’t want to repeat the experience with a tree or a lampost and sold his road bike. He still races though. Nutter.
See what sort of odd looks you get at 7am in the middle of winter when it’s dark and about minus 5! Seriously - put the heater on and it’s lovely and toasty. You might want hat.
Only thing is that the roof won’t fold down when it’s frozen. I sometimes have to drive a couple of miles with the roof up until the ice thaws then pull over and put it down.
The handbook says not to lower hood when temperature is below 5 degrees. Because you will crack it.
That’s no fun. Like I said - warm it up with the heater for a few miles then it folds down no problem.
Didn’t have full face helmets when I rode 'em. I think they called it a Jet helmet. Got a wasp stuck in it once as well. Puts you right off concentrating.
I do that on lovely glorious sunny winter mornings. Big fake fur coat, fur hat and sunglasses … nothing finer
Gave up biking after 40 years - the MX5 was going to be it’s replacement ie still get part of the freedom that a bike gives you. Yes, I used to turn up with a big grin on the bike but these moments were getting less and less. Riding a bike on Cambridge roads is very much like riding a SAS survival course. Cyclists pulling out of nowhere, pot-holes big enough to swallow a 747, diesel spills just right on a corner and being hated by car drivers. Plus there is a lot more traffic on the roads and you need all your wits around you all the time. Perhaps I lost my mojo - perhaps it will be back - who knows.
Dunno how you biker types can live with being so constrained on two wheels by having to get dressed up every time your leave the house - boots - check, trousers (leather or gortex) - check, jacket - check, back protector - check, helmet - check, day-glo bib - check, change of clothes for the office - check. 
I always wear trousers, boots and a jacket whatever mode of transport I’m using. Even walking. The only extras for a motorbike are hat and gloves.
Although today I drove to work in my MX5. Roof on, so no need for sunglasses, hat, scarf or sunblock [:D] Made me smile just as much as the bike, but took slightly longer.
Hmmm - a bike AND a MX5 - that would take more than a bunch of flowers to persuade SWMBO to let me do that! 
There is a person at my work that NEVER lowers the hood (cantilever steel top MX5) because she says that she doesn’t feel safe at traffic lights. My first thought was “Why buy a cab then?”. After a while I thought that she would have bought a MX5 that had a permanent roof because she likes the driving attributes of the '5. Each to their own.
Mrs Muppet is quite happy that I’m down to just the one bike and two cars. The trick is to get a budget approved for a car, then spend that on several cars instead. [:D]
She can’t complain too much as she has a car and a bike too, and they are both newer than any of my fleet.
Think I went out on the wrong day.
Drove Bristol to Falmouth & back, saw 6 MX5’s all with roof up but Audi & 3 other cars with roof down (think 2 were Audi’s), must hav been their day today
.
Had to put roof up this morning as a bit to much rain on the outskirts of Okehampton, did put a body warmer on first thing as slight chill at 7:30 but tooo warm when roof up. Good drive which ever way.
Reigate to Porthcawl last night - roof down all the way. Only way I could keep awake. Also good for shooting star spotting.
Bikes = fantastic, MX5’s = equally fantastic.
Bike for being a hooligan on my own (Steve Parish commentary running through my head as a nail a set of twisties)
MX5 for being a hooligan wilst chatting to the Mrs, having a cuppa, and listening to the stereo. (Mrs Snurfens commentary ringing in my lug’ole as I nail a set of twisties).
Happy days! One day I’ll be in a nursing home dribbling.