I've recently assembled and painted some IWM sculpts. Here are my impressions:
Prime Mover This big boy is easy to assemble (main fusalage, 6x weels, turret), looks proportionate to all scales, minimal mold lines/cracks. Happy with this one.
Wheeled Scout BT-466 Really impressed by the level of detail on these. Assembly was minimal (fusalage and turret). Scale was appropriate. No cracks in metal.
Cyrano VTOL This mini is perhaps the best VTOL in IWM's catalogue at the moment. Parts included main fusalage, rotor, and turret/laser. Details were crisp and symetrical. No cracking/warping. Size was appropriately scaled.
Black Knight BTL-9KNT 20-5207 Definitely meant to be a showcase miniature for your ComStar forces!! This mini is slightly smaller than CGL plastic mini, however not as notable as others like the Battlemaster, Griffin, Wolverine, Stormcrow etc. So great news on that. Mini assembly was not difficult, but the mini does not offer much posability options other than choice of running or standing using leg selection and positioning of head. I was able to cut and drill magets into the torso and waist to allow for torso twisting with no rubbing, so that was a major positive. The parts included head, torso, waist, 3x legs, 2x arms, sword. Unfortunately, the head has a laser on it and the BL-9-KNT is not supposed to have a head mounted laser. But it was not difficult to swap with a plastic head from the CGL BL-6-KNT and cut the laser off and re-sculpt.