From what i understand he only repairs clean cracks. and these plastics are pretty scuffed up.
Correct me if i'm wrong.
I'll repair ANY broken fairing, rashed or not,...
I DO NOT PAINT, or do bodywork anymore (except in rare cases)
so I can get your fairings back in one piece, even if it's just shattered with pieces missing broken tabs, etc, but if the damage is extensive, or you've lost too much plastic from the road grinding the plastic away during the crash, I will have to weld it from BOTH sides, which leaves a strip of bare plastic where the weld bead is, so you'll have to go get it painted somewhere.
if it's a clean crack, often I can just weld it from the inside, which just leaves the line of the crack on the outside, and no damage to the existing paint, which can then be touched up with touch-up paint.
ok now for do it yourself stuffz:
FIRST you MUST ID the plastic in question: is it ABS?, is it polypro? is it fiberglass? or an "olefin" (polyethylene, TPO, etc,...) look on the inside surfaces there should be a ">ABS<" thingy (the letters will tell you what type of plastic it is, hopefully it DOES NOT SAY: >PS+PA6<, or anything with a "+" in it, because that will HAVE to be welded as it's an "alloy" or composite made from two different types of plastic, so if you DO have an 07 GSXR it'll be an alloy.
as far as your choices, the PLASTEX looks like the best one, I'd probably go with that one as the devcon sucks (unless your fairing is ABS), I couldn't get the color-rite link to work, and SEM's plastic goop does only come in bulk, and again really only works on ABS
there are a few others like FUSOR, and a couple by EVERCOAT which are both GREAT products, IF it bonds, and the only way to tell if it's going to bond is to test it.
this is why most plastic repairs are done by thermally welding these days, as the variety of plastics is just ridiculous and if you get the wrong type of goop for your particular plastic, it wont work.
if you do decide to do it yourself be sure to FOLLOW THE DIRECTIONS EXACTLY, especially the cleaning steps as those are critical to a good bond.
also if you DO try the plastex, please post the results and outcome, their advertising is quite convincing stating that it will bond even olefins AND composites, and I'd be interested to see if it does in fact work on the newer composite side panels.