Dove Ginnie Springs on Saturday and hit Devil's Den on Sunday. These were dives 11-13 for me - started with about 8 hours bottom time.
I did all right at Ginnie Springs, I'm not so sure that I was ready for a cavern even if it was the ballroom. I didn't hit my head or kick up too much silt, but once we were in there in the pitch dark with no other divers, it put me on high alert. Frankly, I was too cold in 3mm with the air temp hanging in the 40s. Also, I still rent gear and their gear sucks, I had to exchange my reg between dives because my primary was difficult to breathe and I had to switch to my secondary. I wanted to do the Ginnie Springs the first dive and then head up river for the triple springs, but after the first dive I figured I needed to do it again to become more comfortable.
Devil's Den was packed, so I went in as most of the large groups were finishing up. It was a really neat dive, made it around twice. Went through a couple swim-throughs and looked around on some of the walls, but didn't spot any fossils. After that, it was just a bunch of rocks. Their rentals were pretty decent quality.
While they aren't the most spectacular dives, I enjoyed both of them. I can't say I'd recommend Ginnie Springs for a diver of my experience unless they are with a guide. After two days of dark, cold dives, I really look forward to getting back down to BHB in the sun!