Zero has been using them for about 6 months. I love them. He makes a fuss while I'm putting them on, but once I'm done he doesn't seem to notice them. If they were uncomfortable, I would think he'd stop walking or whine a lot. They do seem to stick out more than usual, but they do retract.
"6) Can cats still extend and retract their claws with the Soft Paws?
Absolutely. Soft Paws are designed not to interfere with the normal extension and retraction of claws"
I highly recommend them if your kitty is very playful or likes to scratch things he/she shouldn't. Otherwise clipping may be sufficient. Zero is still young, I think he may not need them when he gets older and calms down
He's gone patriotic now: