I don't have this kit either, but I have 5 or 6 Ardpol 1/48 sailplane resin kits. Surface detail is very subtle, but seems to be complete. Some of the kits have common cockpit details, which may not always be accurate. The older kits were molded with tan colored resin that may warp over time. The newer kits used a light blue resin and the way the parts were designed with molding stubs indicate they were trying to improve the tendency to warp - an improvement over time. As far as fit goes, they go together like a typical resin kit - you may want to improve the strength of the joints by adding pins in some cases.
I am a fan of sailplanes, and there are not many choices. Ardpol was one of the few companies that made more than one sailplane kit but sadly, they appear to not be in business anymore.