I own a 280C. Book numbers on mine with a few add ons are
Gross weight 2350lbs.
Empty weight 1604lbs
Useful load 746lbs
I do not have a lot of time in it, but it does have plenty of power compared to R22.
You can easily overboost with the turbo so you have to stay on top of it. Especially on a hot start.
Summer with full fuel and 2 adults you have to use good technique and keep the RPM at the top for best performance. I haven't had 3 in it yet.