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These are a bit of a pain to get on so make sure you pick out which ones you want before putting them on, you definitely don't want to be taking them on or off often. That being said once these are actually on the sticks they make playing a lot more comfortable, adds a bit of bulk and grip to vita's tiny analog sticks.
These are just what I wanted. They stay on nice and tight, and give the sticks a nice grippy feel. I don't know why I needed 6 of them though. I wish they'd sell them in sets of 2, or perhaps 3 in case you lose one. But I'm not unhappy with the purchase though.