I was looking up for some other testing gigs and came across some negative reviews about usertesting. I have been testing with them for a little over a month now, and every test I have taken I've beed paid on. Now the tests aren't back to back. On average I get about one test per day. Some days I may get three. Other days there may be none. But I've found that they are reliable and pay on time.
***I have yet to have on single issue, whether with getting tests or getting paid.
I think the key is to do good in your initial test/eval. If you get the concept and know what they are looking for, you will get tests -- I think it's that simple.
If I ever get shafted I will be the first to broadcast it. My brother also tests for them. He too has had zero issues.
5 stars!
Adam A