I also had a great experience with Crex! I used a pool that said it would support mining to exchange. I found out later that the pool ignored the payment ID. I verified this by trying to mine to my own wallet with a payment ID and the payments came without payment ID.

I gave Crex the TIDs and my funds were soon credited. The problem wasn't on Crex's end but I was given a quick resolution. I will be doing as many of my trades there as I can