It will be quite some time before I go to saltwater. Probably June or so, at the earliest. Living in KY, the ocean isn't really readily available (10 hrs away). 85% of my diving is done in a freshwater quarry & eventually (likely very late this year or next year) I'll be taking it to FL to learn to use it for cave diving (also freshwater). The caves are the primary reason I decided to go to a rebreather.
Actually, the buoyancy part wasn't as bad as I would have thought. It wasn't perfect, but not overly bad either. I wasn't "yo- yo'ing", crashing or anything that severe, just bumped the bottom a little here & there. I just need to let my reactions to the changing gas volumes become a little more intuitive to get/ maintain control. I tried a couple different weights that first night. At first tried 4 lbs in each of the pockets of the counter lungs, I found, once I got down, I was rather negative & nose heavy. My instructor then told me an easier way to descend. Lo & behold, it was much easier & I didn't need so much weight. I then tried 3 lbs in each pocket & was not quite as negative & was perfectly trimmed out Head to toes. I may even try 2 lbs in each pocket & a little adjustment of backplate for trim to see if I can improve on the negativity, but honestly the two 3 lbs weights weren't that bad.
The course, while yes, will be stretched out, I'm not losing anything I've learned (yet) because my instructor is constantly lecturing me & drilling me, verbally, when I'm working at the shop (usually 3-4 days a week). One big thing my instructor has been hammering me on is, if ANYTHING doesn't feel right, get off the loop immediately & onto bailout for a few "sanity breaths". Then try to figure out what is going on. Even if it is or isn't anything I've done the right thing.