I have one of these beasts and it is an absolute joy to use. A total ferrari of enlargers. It's rock solid and I've never made such high quality prints before. If you're in the market for a 4x5 or medium format you would not be disappointed with this system. Currently I just use it for B&W VC papers in a manual fashion. The control box is very easy to use, basically punch in time and filtration. There is a lot of advanced programming you can do on it but I have not gotten into that yet. The timing is extremely precise, and controlled within the bellows via an internal shutter. If you need to know anything about these let me know. If it wasn't so heavy I'd buy it and have it shipped over as a spare! I love this enlarger..