(I can not answer with the experience of having owned an outboard RT. so I make this comment based on my analysis of the performance charts I reviewed in detail before upgrading our inboard R25SC to a R29S) One of the biggest drawbacks I see to the outboards is those all day runs at 8 to 10 knots pounding into 3 footers with the occasional 4 or 5 footer. You don't want to pound your boat and yourself to death at the speeds the outboards are fuel efficient at and at 8 knots where it is comfortable the outboards look very inefficient. We had 4 Sea Rays prior to buying our first Ranger Tug and they had hulls and performance characteristics more closely related to the RT outboards. In flat water they were great. In the 3 to 4s, which we often had on the Great Lakes, I slowed down to 8 to 10 knots. The Sea Rays were IOs so not as poor performers at those speeds as the outboards. I miss the ability to water ski and have smooth fast runs on inland lakes but not as much as I thought I would (my brother has a couple of ski boats so I just do that with him).