I've tested the I30N perf manual(with all the settings at top, except for the suspension in normal mode) yesterday and I like it a lot, but also there was a few issues...
The good:
Amazing steering feel (in nowadays steerings), super confy suspension (in normal mode), very good chasis, and just the best sound at any hothatchback price (even the pops and bangs are louder than an M2)

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The bad:
I found quite lag from the throttle, I know is a turbo car and I own a NA engine, but it seem's very slow at low rpm's, then above 3.500 and the turbo is full yes it flys. Interestingly enough I also drive a prefacelift I30N and to me the throttle response were much better and felt faster... (This reason could be cause the car was brandnew (25km) and of course I neither floor it to the redline...
The traccion, Im used to RWD so I always floor it without worry too much and the car stick to the ground, but in the I30N seems to bogdown and lose traccion (I know is pretty common in FWD, and with pilot 4's could be solved).
The last thing is the price, I found out quite expensive (37k € in Spain for the manual version) it's just toolmuch, the GR yaris cost 34,4k € and with 1K more you could installed and exhaust.
To sum up: I really like the car, I think is the best fun FWD car, but really isn's as enjoying as a RWD.