I understand Special 25's comments and which make sense and maybe this is Freewheel's concern also aside from having backup for key data but, presumably, if this has been certified then it means the reliability of showing Nr has been tested?
Spinwing asks why? I was thinking for a private aircraft (say you buy a used 206L or even 406) the analogue instruments begin to look a bit outdated whereas the glass makes the aircraft appear more up to date. Its superficial .. I agree.
I think Blackhawk9's comment probably make most sense for installing glass in that its going to prepare newbies for this same technology in other aircraft.
The Vector set up maybe a bit exxy (expensive) but I know you can get an EFIS kit in the US for low money.