I bought about 25lbs there for my RSM. It did not have high ammonia, and didn't smell too bad. It had what I believe is green coralline algae on it, but it looks crusted and slimy, rather than crisp like purple coralline.
I've had it in my tank for a week now and seen little ammonia spike. I've not seen any hitchhikers or pods either, so I can't say if it's good or bad. I added a pound or two of really nice LR from my 55 gallon on Thursday and hope it seeds well.
I did see a number of nice corals there (mainly softies and LPS) at very reasonable prices. They also had 1 EBO 1/5 hp chiller for around $300. Seemed way too good to be true, but then I picked up a 1/5 hp JBJ Arctica off CL today that is 1 year old for $350.