Okay Gentlemen, I am workless at the moment since my reports are down at work. So... let me chime in a little.
Albiet, I understand why anyone would wear mesh jacket. The heat and they also feel lighter.
Here are my concerns and I would recommend you don't. First off Hooker, I know RedRider did not mean anything by his comments - maybe just a little animated.
Anyway... with synthetic fibers, one of the greatest concerns is friction and heat. In a slide, the contact between your material and the road causes friction which in turn causes heat. I have seen where a leather jacket built up enough friction to cause the inner lining to melt and burn the rider on the shoulder.
Now, imagine you are in a synthetic jacket and sliding on tarmac, not only would it potentiall burn through the outter shell, but also the stitching and then the lining and then YOU!
I realize more new materials are treated and such for this, but you still cannot beat the properties of hide like leather.
Secondly, it takes a conscientious manufacturer to put actuall full CE armour in a material or mesh like jacket, at which point you might as well wear leather. Cordura for instance is a good compromise on mesh / synthetic jackets, but it won' breath or let in as much air as a pure mesh jacket.
My suggestions would be to get a leather jackets with ventilation. Gericke once made a jacket called the Warrior that had EXCELLENT ventilation. I mean, you would actually get a chill at high speed. It was leather, with complete perforation, and strategic zippers which allowed air to flow - much better than just holes.
Secondly, if it must be mesh, then go for a good compromise where the impact points are leather, like shoulders and elbow regions while the rest is mesh. That I think may give you the best of both worlds.
Any protection better than nothing, and you and I are totally on the same page there Hooker... but, for what you will spend, remember, any protection gets one chance to prove it's worth, and that can literally be over your dead body or skin.
My .02 cents.