A few weeks ago, after doing some extensive research, I decided to purchase the ControLeo2 reflow oven controller kit from whizoo.com. I've been doing reflow by hand since the beginning, starting with a pie tin on the oven, then going to hot air, then to a hot plate (and combination of hot air, depending on the parts). What I was after was a solution that not only reflowed automatically and consistently, but that also reflowed correctly (most cheap ovens and PID kits do not). The ControLeo2 self-tunes and adjusts itself to conform to the J-STD-020 reflow profile. It will not allow you to reflow if things aren't within the appropriate parameters.
The kit came well packaged and there are instructions and build pictures on the website. Even with the instructions I spent a full day building the oven and getting things running. There is a lot of time involved in this project (to do it right). You have to be meticulous in your insulation of the oven and high-voltage wiring.
As with most complex DIY projects, you can expect to run into a few snags along the way. Once I got everything put together I ran into some problems getting a reflow to complete. After some e-mails back and forth with Peter everything was solved. He helped me understand what was going on and what to look for. His expert advice was exactly what I needed to get everything running 100%.
After using the oven for over a week now I can say that I am very satisfied with it. Recommended!
Whizoo sells just the bare controller (add your own relays and other parts), oven build kits, and complete ovens.