Honestly, I have a real photo lightbox / phototent and I find them really crappy. I've tried them with snakes but usually they come rushing out the front or you just can't get the frame right (annoying corners etc). I use a fairly cheap softbox studio light system with my Canon DSLR and I love love love the light!
Here's a photo I made with my set-up, the background is just a big piece of white paper:
