Carlson is AutoCAD or InteliCAD based, so the question really lies in what your skill level is with AutoCAD/AutoDesk products since the engine for Carlson is CAD. Magent, from the guys that are Topcon users, are mixed; some like it some dont. Personally I love the function of Carlson Takeoff not only for 3D Models but for earthwork and paving takeoffs and i build 100-150 models per year from site, roadways, and airports. If you would like shoot me a PM and I can give you my contact info to help steer you in the right direction.