Picked up my VP-112 and played around with it over the weekend. As others have said, I need to push down on the lid (in my opinion, I have to push quite hard on it) in order to get it to seal.
I've ran some tests over the weekend, and the most that I've been able pull on it is -60 cmHg. Considering the air pressure around where I am is roughly 75 cmHg, that means that I'm only able to get about 80% vacuum. It hasn't affected anything so far, but it does bother me a bit.
All in all, though, I'm pretty satisfied with it. The chamber size is plenty big enough for my needs. I'm strictly an amateur cook, so I don't think that I need the fine control of some of the more expensive machines. I haven't had a problem with bags not sealing, or not removing enough air when I cook sous vide.