It's been a couple weeks since your OP, but I was just at the site yesterday and the facility is set up well. As far as what there is to see:
They just sunk a boat in about 55-60 ft of water right off of the main platform. A couple of kicks away and in much shallower water is an old Ford Van (15-20 feet). Additionally, there is a crane, a schoolbus, and a few other sunken boats around the quarry. While it is said to be 165' feet, the thermacline is pretty serious. Yesterday the surface temp was ~88-90 degrees and at 30 feet dropped to the mid-low 60's. Visibility was about the same at this depth asthe surface, 10-12 feet. At further depths the temperature was reported as getting down to 41 degrees, however, since I was hoodless and gloveless (and tend to get cold easily) I can't verify anything lower.
Currently, they are 'Only open on weekends' and don't answer the phones during the week, which makes contacting them somewhat difficult. They do, however, update their facebook page almost daily and it is possible to talk to someone through that platform during the week.
All in all it was a very pretty site, adequate vis, and friendly staff. With the varying platform depths (4', 6', 12' 20' 60'...) it was set up very well for C.E. which is what I was there for. Also -- being 3 hours closer to me than any other alternative is a huge plus. I will be going back there.