I fly a 172 and think they are lovely!!
I'm 5 foot 6, and I use a cushion. I also use a cushion in the PA28, and I also use a cushion in the Hughes 300...
No problems! Except sometimes in a crosswind when ****loads of rudder is required...
There was one comment I agree with - a lot of people that have learnt in a 152 tend to get in a 172 and "let" the plane fly them - or alternatively tend to fly with less power so that it behaves more like a 152!
A bit of time under the belt and a good type rating should allay these problems.
Peservere - and enjoy!
PS: the little jet does look pretty cool, but I'd want to have been diagnosed with a terminal illness before strapping one on...