Well I finally made the switch. I have been used to diving an aluminum 80 for a long time, and after many discussions with other divers I made the switch to a 100cu steel tank. I never realized the differances between steel and aluminum would be much. For starters I only used 8lbs (which fit in the trim pockets on my BC) with aluminum, and with the steel 100 I got rid of all of my weight. There is no "end of dive struggle to stay under" because the tanks stays negative the entire time. It is going to take a few more dives to get used to the steel tank. I have noticed very fast decents, and to stop I have to really hold the inflator on the BC. Unlike aluminum where you just tap it once or twice and sustain, the steel tank requires a little more air to slow the decent. Something that I like better is when surfacing I no longer have to watch the computer for speed anymore, the weight of the steel tank seems to do just fine for slowing me down. The other thing that I love about the steel 100 is the amount of air. I am told by the people I dive with that I must have gills. I am very easy on air. With the steel 100 I made a 77 minute dive this weekend at a depth of 55 feet, and I came out of the water and still had 1000lbs. I must say that the change I belive is going to be a good one. If anyone has any pointers on diving steel (because it is new to me) please let me know.