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They're no worse than normal lenses, but if you've never worn any before it'd be a really good idea to go to an optometrist first; they'll teach you how to put them in and get them out safely and whatnot. Once they're in you really can't feel them, unless like.... there's wind blowing into your face, then they just feel cold.

I know, I was talking about contacts in general when I suggested going to an optometrist xD They make contacts with no prescription, too- so they won't alter your eyesight at all.

It's really not bad, the worst experiences I've had was once a hair or something was stuck to the edge of a lens- and even then it's no worse than an eyelash falling into your eye, you can rub it out sometimes or just pop the lens back out and wash it. Aaaaand, when I first got them, I had trouble getting the one in my left eye in because I couldn't see it as well to get it into place.

I prefer my glasses, though- it's less hassle. You can throw those at your face and be on your way. Plus I think I look better with glasses on.

I don't have a specific vendor, unfortunately- there are a lot of databases though that keep tabs on who is reputable and who isn't, especially if you're looking through the Circle Lens fandoms. Just make sure you research the site that you're buying from before you commit to ordering and you shouldn't have any problems.

If there are known problems, information about it won't be hard to find.