I've done quite a few hours in the Katana and I like it.
The stick takes about 5 mins to get used to, and is very crisp and responsive.
Very docile in the stall, doesn't really tend to viloently drop a wing, even with power on.
Bubble canopy gives great vis but is a bit like a greenhouse on hot days.
Steering with the toe brakes does require a thin-soled pair of shoes as mentioned above.
Intsruments aren't anything to write home about; all electric so no IMC at all.
Good 100kt cruise, low on fuel useage, but do watch out on a hot day with full fuel and two-up.
Anything I've missed?