What?Cash is ok. It's not a fast earner, but it does grow. Ad results are pretty good. I was a member before the current owner. I believe it was something else, then merged with a sister site. Can't really remember the exact sequence of events. Been too long ago to remember all the details now. I've slept since then and had way too much going on medically in our house.
It was behind in payments back then, but slowly improved. Now, as far as I know, payouts are timely and the site runs well.
I redeemed for ads for my PTP's not too long ago. They were set up quickly and I have had good results. I had to change one and that was handled quickly.
Best I can tell you. Sorry it's not more specific. As far as I know, What?Cash is a pretty decent program at this time. If there are any big issues, I've missed them completely.
HTH
ETA: Oh, looks like your thread started late on a Saturday night of a holiday weekend in the US. Probably why you haven't had a lot of response yet. It's the last big swimming/lake weekend. After this, all the public swimming pools close and it gets too busy to go to the lake.