I love it, I have the screw version but I think the vice version is more versatile. Agree with the opinion of the top weight but I'm so used to it and I don't care too much.. The best is the different settings that you can handle.
Lastly mine has a problem, the machine seems to drop/increase the power by itself once I'm working with it for like 1 hour or so...
Tried it with different power supplies (cheyenne/critical) but it happens no matter the power supply...
Anyways I like it and hope to fix the problem soon.