2 of us went to Dive Haven last weekend. The conditions were excellent! (some people there said it was the best vis they'd seen all year). We started on the back side of the quarry and dove on the boat, bus, car and crane. Vis was about 15-20 feet down to 30'. The thermocline hit at 30' and dropped the vis and temps considerably (temps 78 to 30' and 66 at 42', got colder below that). We did 2 dives on the back side and then moved over to the "training" side and did a single dive.
We started out trying to find the 58' van, but got really cold around 53' and couldn't see the line or my fins, so we bailed out and headed over to the training platforms. We were about to call the dive about 15 minutes in out of sheer boredom, but started to dive along the wall, skirting the thermocline, and looking down into 130 feet of nothing. Wall was pretty interesting and spent a good 30 minutes exploring it.
All in all, Dive Haven was a good dive (although I wouldn't want to spend any time below 50 feet) and relatively close at 2.5 hours from us.