At first I thought my Formula 312 had a much larger cockpit than the Sonic, until this weekend.... I was in both my Sonic & Formula and there may be 6" difference in the two ..front to back that is. If Sonic is listening, it would be REALLY nice if Sonic offered the McLeod's bolsters as an option.... They are absolutely the best electric bolster made.... the movable floor 'ain't so bad either!!