Ive always used go daddy and never had any problems
Seriously though I have a few domains left there, the reason I used them in the first place a few years back was the ease of use, management of the domains etc. and ease of locking them and that sort of stuff. We dont get the ads here for them. I read the posts about the problems people were having with them, but it also comes down to slackness to transfer a bunch of domains, the extra cost etc. I only have a few there now and have not regd an new ones there for years, so I guess it has sunk in, the bad stuff I've read. Anything new now, I use name cheap, I havent heard too many things bad about them.