I had the 215 hp sportster 150, I would bet that the extra power with the 255 would be more fun, WOT is a bit more and the hole shot I would think would be better, don't know what the price difference would be between the two, but I would like to say that my boat had 255hp than 215. I just traded in my sportster for an 09 challenger with the 255hp motor, I have 13 hours on it and the power is nice even with a bigger boat, I would be okay to say that the hole shot on my challenger is close to the same as the old sportster. The motors are built the same if it is a 215hp or 255hp and BRP has been making them for a long time, the only difference is the supercharger the 255hp has a different blower wheel to make up that extra power, so as far as reliability it is the same motor, and I'm sure that the 255 sucks up more gas, but probably not that much more to worry about