I'm a tester for TryMyUI and I can confirm that they do not pay you on time and they also do not return any kind of communication you try to initiate with them through their contact form (I have even checked my junk folder). I've contacted them about 3 times through their contact form in the past month and haven't gotten anything back from them. On their website, it says that you get paid for your tests every Friday but that only happened for the very first test I took. Since, then I've taken 3 tests and haven't gotten paid for them. I should have been paid for two of them two weeks ago. Also, I'm pretty sure that they do not conduct any kind of user testing on their own website. Which is pretty ironic, right?