Price up extra mags first. ICS are good make but 552 mags are different to common G36 ones so look into it a bit before you dive in pethaps
Cant say on that model but ICS are pretty solid, I have an M4A1 and L85 both are great guns, solid out of the box and if it wasn't for my own meddling the L85 would still be perfect.
ICS are good guns, make sure you add a Mosfet though and maybe a decent bucking tightbore barrel and there solid.
ICS are good make but 552 mags are different to common G36 ones so look into it a bit before you dive in pethaps