For me the biggest benefit of the bracket would be the extra room in the boat. Planing faster is good too. But those are things that I can work around. Can't work around a motor digging in when you need to get into shallow water. Even the 150 on tbe bracket would prob too much of a trade off. May or may not end up throwing the 225 on there without the bracket, don't think the extra 140 pounds would be too bad. But if I like the 150 well enough I probably won't. If it's reliable and fuel consumption is decent (only 60 gallon tank on these boats) I'll just go fishing. The biggest reason for considering the swap to start with is I know my merc is a good motor, don't know jack bout a mariner. Broke down on a boat sucks! Ask me how I know