you are replacing a plastic piece with a anodized dourable aluminum part.
The only weakness is the price, only for people who ran out of mods
I am very specific about how my marker looks and the upgrades done to it. My IR3 Fly looked great, but the clear red plastic breech knob just stood out as a cheep piece. Although it's just for opening the bolt, I wanted a anodized peice that would also be dourable. I don'ty have many possible mods left for my gun, so this was a good addition.
If you are very picky about the appearance of you gun, this mod is for you, idf you could care lkess, then spend the money elseware.