Good, but could be great with a few more tweaks.

This is one step away from really being a fantastic product. Here are my recommendations to the programmers:
Make the "modeling light" into a "view" or "preview".
Allow us to position the model. Even better, give us options for a couple of more realisticaly rendered models.
Make the model stop spinnning! The perspective should remain static from the cameras perspective.
Give us a better visual cue when a light is selected. Sometimes I go to move a light and another one moves instead. The lights should glow when selected or give some other kind of visual cue.

If those items are changed Ill gladly return and issue it 5 stars!

Dad on the run about SLR