I went on the Fling last year I think in July and had a great time. I guess I got lucky with the weather.
Best thing I guess would be the diving. We got in Seven dives. Five on Saturday and 2 on Sunday. Great food after each dive and lots of fun discussions and movies in the galley. They had a place to charge batteries and a big screen TV to check out video from past dives or movies. The whole upper deck is open for sun bathers and the Camera Table and Rinse bin seemed well taken care of. I saw lots of cool fish (Trunk, Squirrel, File, Angle), a couple of moray eels (including one baby), a sting ray, and off in the distance an eagle ray.
Worst thing? I really don't know. Like I said I lucked out with the weather. Anyway I don't think we had many hurricanes last year. I've heard the current can get stronger and the waves a little bigger than they were on my trip. The water was nice. I dove in a full 3mil I might have even bee a little warm.
My shop is Scubaland Adventures and they are leading several trips out there this year.
Texas Flower Gardens
I've heard the Spree takes fewer divers so that the ship is less crowded. But again I was on the Fling and had a great time too.