I had a Borg Warner velvet Drive Trans in a 25 Baja with 330hp 454.
From what I've learned it automatically kicked into higher gear when you banged the sticks up, but was a nice slow Idle around the docks - the boat was very easy to handle in tight areas, but in the open water it kicked into the higher gear (I guess - I'm still learning about this boat that I don't own anymore...)
I also had the TRS drive on it, - the drive was pretty tough, I beat it up pretty well and didn't have any problems.
I do believe that the added weight of the Trans slowed me down a bit and considered going to a Bravo Drive, Parts are alot easier to find for a Bravo - TRS parts are hard to find, and anyone that has one and knows what it is will probably rape you ($$$) for the parts you need.
Probably not the best info, - just conveying personal experience..