Andrew,
We recently purchased a 2018 Four Winns H230 w/ 6.2 Merc and Bravo III. It was a late season purchase from a Four Winns demo day that had 16hours, way too good of deal to pass up, stole the thing. Anyhow, the 6.2 now has 37hours on it, I cannot say enough good things about the motor. It's very quiet (at least compared to my old 3L Volvo), even at WOT you can talk to the people without screaming. As far as power, well, it'll throw a person down even when going 30mph then goosing it, very powerful, at least in the H230. It has no problems moving with 11 people on board and planing in less than 4 seconds, maybe even 3, just haven't timed it yet. Skiing, wakeboarding, towing is not an issue. Cruising is at 26-27MPH and is so smooth, you hardly notice the thing running, Bravo III also helps with that.
There has been one recall on mine which will be fixed before it comes out of storage in spring, the power steering pump pulley had an issue when it has been know to create undo friction and could cause a fire. If you have the solid pulley (the one without the holes), then it's under recall. For the reliability as others have mentioned, it's just too soon, but it does seem to be a very smooth, well built motor.
Take care,
John