Just ordered an X18 with the F150 instead of the SHO 150 in order to meet my budget($2000 difference) I had set and still get the other options I wanted, sea dek, 6"jack plate and the Foretrex upgrades primarily. Question is, of course top speed, but mainly how quick to plane and any issues porpoising. Currently have 2012 X 17 with F115 and the only issue was chime walk at WOT that vanished with hydraulic steering I added. I know X 18 owners are few and far between but the 19 was just too much boat for me at 65, retired and no longer T fishing so top speed is not a must just fun.