Pros
If you're a good writer you'll do well here. All of the bad reviews are bogus. I've worked for a few of these types of companies, and by far, The Content Panel is one of the best. Within my first year I was invited to write for them directly as a freelance team copywriter. The jobs at that point started to hit the 90$ mark and have been pretty consistent. All in all, I have no complaints.
Cons
There's really no bad side to it. Sometimes the job well runs a little dry, but it doesn't last long when that happens.