I bought Paralogix Level 1 last spring. I use it mostly for concept designs and find that it works great. I use Solidworks at my day job, and while Solidworks offers alot more tools, Paralogix compares favorably when comparing similar features. For me, Paralogix has a more straight forward interface and is less rigid than Solidworks. My only complaint with Paralogix is that the new releases don't offer alot of new features. But, hey, it only cost $449 as opposed to $3995.