The iSonics are race boards that take a bit more practice to figure out all the bugs. I agree that the back foot straps are tough to get into. Repetition will make it easier.
With the outboard position of the back straps, it's a small target to hit without stepping on the strap or sticking your foot in the water. I have a 111, not the 122.
I switch frequently between three boards, all with different strap positions so it's a challenge to hit the mark every time when I jump to another board.
On the iSonics, the acceleration is so qick that you can be moving pretty fast before you can get the back foot in the strap. I find it more difficult to hit the target while bouncing over the chop at speed.
I get Andy c's concern. And yes, the futura's are probably a better opition for him.