This is a good basic CAD type sytem, with a few problems. My main problem with it is the difficulty in dimentioning and constraining items. It can be done in a couple different ways, but none of them are easy, especially when compared to high end CAD systems. It can also have drawing errors if you don't have a new enough graphics card. You really need at least 32mb of VRAM in order to get it to draw correctly.

THIS IS NOT A UNIVERSAL APP! If you are using an intel mac it will not run well. I can run it okay on my 5 year old iBook 500, and it runs well on my iMac G4 700, as long as I keep the geometry simple. Any PPC mac of 1Ghz or more should have no problem at all with this app.