I have quite a few friends who switched to Cricket, including two who are actually managers at Cricket stores. They've expanded exponentially in my area since the ATT buyout. I've heard nothing but good things from them so far. No complaints.
The only possible negative I'm aware of, is the 8mbps speed cap on LTE. For all of my friends, they don't even really know/care about this, so it's a non-issue. Unless you're a very heavy downloader, I don't think it would be a problem.