I have one and I SWEAR BY IT!!!...Honestly this was one of the biggest deciding factors that led me to just go ahead and buy the C6 vs a used GS, (well its also a scooter and I can still go to all of the Classic scooter events that I have been going to for 20+ years) I have used them on Vespa/Lambretta for years and I already knew how great they were. I do like the fact that it attaches to the bike and is fleece lined where it would touch yer legs. The bodywork needs to come off of the front of the bike to install it, but after it is done I will only ever unclip it off if it gets hot. I even leave it on when I go out with a Pillion. No Worries.
The last clip on the bottom closest to your feet is of the "break away" type so if you actually panic and attempt a Jumping Jack approach to putting your feet down, it will allow you to do so. I have never had any issues as I just come to a normal stop and put my foot down. It is loose enough to not be of any worry. It does have some ribbing imbedded inside it so it tends to keep its shape very well. I do not usually attach the supplied belt when I ride. I might be more tempted to do so if it would ever rain here in California. The seat cover is nice to keep the Dew or condensation off the seat so as to keep bum dry.
I only notice it causing issues above 80mph. Aerodynamically it will flap a bit but keep it at a 'legal' speed and its a non bother.
If you think that you need one....Then you do in fact need one and will love the benefits. plus its reflective and I think looks totally weird and cool.
I wear a suit at work and this is the perfect option so as not to have to deal with overpants. I will wear overpants if I do go out on a full day ride if the weather is cold. I say why leave the comfort in the garage when it so easily clips onto the bike.
Cheers,
Christian