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A couple of important points to remember about covers...
There are two ways to go with the material - breathable or waterproof. The breathable ones are great for keeping dust and dirt off the bike, but don't work so well to keep the bike dry in the rain. In fact, some of the breathable ones soak water up like a sponge and if on your bike in the rain you end up with something like a thin, wet towel draped over your bike... And what to do with it then.
The waterproof ones keep the dust and dirt off, too, but have a bit of a drawback about moisture themselves. That is if you put them on the bike when it has not yet cooled all the way down then you often get condensation underneath them, essentially wetting your bike down while you think you're protecting it. I've seen guys pull covers off and be shocked at how literally every nook and cranny of the bike was dripping with moisture, and them wondering how it happened.
You also have to consider that the bike really must be clean before you put the cover on. I know that sounds odd, but if there is a dirt and road grime on the bike when you put the cover on then the cover material itself can drag across this grit and scratch all sorts of surfaces up. I've seen paint jobs scuffed and scratched, as well as windscreens, all to hell with covers, and again, the owners wondering how it happened.
You've also got to remember to keep the inside of whatever cover you use scrupulously clean if you want to avoid scratches, etc.
I guess the point to ponder is what you might want to achieve with the cover. I spent decades working in the car and motorcycle business and I never found a cover I would use on any vehicles I used regularly. The only times I found a cover really useful was for show bikes can cars that weren't used often, could be cleaned and wiped down judiciously before the cover was put on, and where the cover could remain spotlessly clean itself inside. Most of the time these covers were used only for transportation or long-term storage, and then we used the breathable ones... More of dust covers really.
I won't use a cover of any kind on the bikes I ride regularly.
Just my two centavos, and as an FYI... YMMV.
Dallara
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