We have a 2011 Yamaha SX210 and love it. I've written some fairly lengthy posts about our experience with it here. In short, it's been a great boat for our family. 100% reliable, extremely easy to maintain, great performance (even though ours has the lower hp engines). I don't know whether it burns more or less fuel than the type of tritoon you're talking about, but fuel consumption has never been a problem for us and the type of boating we do (a mix of tubing, wake boarding, cruising and anchoring). Our is louder than most prop boats I've been on (in fact this in really the one thing I'm not thrilled with about it), but the latest model of 24 footer from Yamaha is reportedly much, much quieter. If you have confidence that the sanbar is in 2 feet of water, you should have zero concerns about crossing it in the Yamaha. I'd suggest either planing speed or idle speed, not a subplaning speed requiring more than idle throttle as that setting may result in you sucking sand off the bottom and through the pumps. Great use of space - better than any sterndrive I've been on - but obviously less space than a comparably sized toon.
Let me know if you have any specific questions.