Flew it on several CJ1/2s and the Challi 300. Loved it. Intuitive and very good displays, if in conjunction with a Collins FMS more info that one could possibly dream of.
Flying Honeywell EPIC right now and I hate it because I know Proline 21. (Sovereign installation that is)
The FMS is the only thing that had me struggle for a while, because I was used to the Universals and the FMS 3000/5000 works different. But it doesn`t take much to get used to it.