I've seen the "Real Triggers" for some £3 on the Game website, and they looked interesting, but really I don't mind the DS3 triggers.
If I saw those analog stick covers, I would buy them, not because I don't like the DS3's analog sticks, but because my DS3's analog sticks are seriously messed up- the top part of the left one rotates, and both look like somebody's bitten them. And my other DS3 has a hypersensitive R2 button.
EDIT: Actually, they're not DS3s, they're both regular Sixaxis.







