I don't wear my collar out terribly often, and mostly to events that aren't related to furry. I've thus far mostly worn my fursuit at conventions, and very rarely around the house. I have, however, worn ears and tails out and about.
I've gotten mostly positive reactions about the ear and tail sets. I wore a pair of ears out to Kroger late one night, and one guy noticed and murmured to his girlfriend, "That's so hot." It was obvious he was talking about the ears. On other occasions, I've left my ears and tail on when going out to restaurants for dinner while attending conventions, and waitstaff and other customers have mostly been curious. They often ask for pictures, or ask what the occasion is, though their reactions generally seem positive. Others have told me I look cute. Two non-furry friends think it's sexy, and I think I've actually gotten both they and another friend interested in furry as a result of wearing my ears, tail, and suit around them.
The only somewhat negative reactions I've had were one occasion when a kid looked at me and said, "That's not a REAL tail." On another occasion, an older drunk guy at a sushi restaurant started hitting on me while I had my ears and tail on, and while I didn't really like the attention, I suppose him coming on to me was better than someone getting offended. I mean, he obviously thought it was sexy or he wouldn't have been hitting on me, right?
I haven't had much reaction lately, but I mostly wear my small, real fox tail when I go out these days. Most people don't really seem to react to my real tail if they notice it at all. I wear most of my real animal products (acquired from ethical sources) for spiritual purposes, but I do wear that one tail out some because my non-furry mate is less embarrassed of it than the costume ears and tail.