I flew a Katana for a while and loved it. It's often described as "slippery" and doesn't like to shed its airspeed when landing. Think the very opposite a 150 with 40° of flaps. You have to stay disciplined on your approach airspeed or you'll end up floating past the runway!
True! Also you need to know how to slip it to get down, because those flaps don't do so much like you said. I loved the Diamond. If I had loads of cash I'd buy one. Great plane. The rental DA20-C1 was in the shop more than you'd want, but that could because we were hard on it, as student pilots.