I owned a Europa Trigear 115hp 412 for a few years and loved every minute in the little aircraft. The owner had converted it from the monowheel a few years before after a ground loop and taking out a few runway lights at Leeds Bradford. The undercarriage was a little bouncy but no problems otherwise.
I had a test flight in a monowheel before buying mine, and the owner (3 years experience) bounced it and nearly groundlooped on the demo flight! He too, emphasised the 'keeps you sharp' aspect of monowheel flying.
As someone who frequently has to take a few weeks off flying, I don't need anything that's a real challenge to land and take-off, but appreciate it can be fun if you are up to it and current.