My wife and I don't have cats (we have chinchillas), but we have a couple of neighborhood cats that visit us frequently. We welcome them since they are both friendly, and both seem to be decent mousers. The tradeoff is finding an occasional surprise in the flowerbeds.
George:
Neighborhood Cat by
Daveography.ca, on Flickr
Chloe:
The Internet Needs One More Damn Cat Picture by
Daveography.ca, on Flickr
And this extra furry polydactyl walking allergen is my in-laws' cat, Bailey, looking unhappy at her Christmas jacket:
Christmas Bailey by
Daveography.ca, on Flickr
Seriously, most cats don't bother me, but I can't spend more than a few minutes with her before I get the full on runny nose, sneezing, swollen eyes treatment. Which is a shame because she is very cute and does have really nice fur.