So I'm trying to buy a Mionix Naos 3200 Mouse Feet.
Personally I use a cloth pad so most likely I'll never have to replace the mouse feet again, so buying 2 mouse feet seems like a waste for me. Are they any good? So far I've only heard good things about Corepad but I'm just wondering if it's worth the extra $10.
If your strictly using a cloth pad than no, but I use my mice on hard surfaces, ie, Granite, Marble, Glass, Plywood, Melamine. Hence the original feet all disappear within a few months of usage. The prices you quoted are really cheap, for me I usually buy several because I go through about two sets of feet per year.
Again if your using something soft and gentle on your mouse then getting extra mouse feet wouldn't be needed.