I've flown about 40 hours in one for instrument training, mostly IR training. I'm a bit hard to impress with this type of metal as I tend to compare any 4 seater with a Jodel 140 and nothing gets close.
However, the Cardinal is a rather nice aeroplane.
Lots of space inside, lots of windows, any sensible loading will be within limits, nice control feel, quite fast.
Also, you can fly the ILS at about 160kts to the outer marker and still make a short landing(no turbo), mix it with the heavy metal.
It looks rather sexy too, kind of sharklike!
It should be more popular than the Arrow.
Hope this helps and hope you like it.