I think it's the best unit on the market at this time. I just bought my second one a couple days ago. I've tested, balanced and charged both smaller cylindricals and larger prismatics with mine since last year.
One word of caution, if you are using it in your car and and have any pack leakage to ground, be VERY CAREFUL with the charge leads. I damaged mine a few days ago and although no magic smoke leaked out, the display is locked up. I knew I had a leakage fault but never tracked it down (until yesterday!
If I can recall the event, I had just finished discharging a cell to 2.7 volts for bottom balance, when I removed one of the charge leads. I hadn't "stopped" the process though I don't believe. (removing a lead will not stop it unless you are doing a multi-cell cycle with balance leads and you remove a few of them. . it will fault and quit. . otherwise, you must click "stop"). Anyways, I removed one lead and inadvertently touched part of the frame. I don't recall if it was neg or pos lead, sorry. . but probably doesn't matter. When it touched. . POP! like a short. . .just momentary, but enough to damage it.
I don't know what level of resistance is required between pack and frame and I won't be testing it any time soon. I bought the second one because I can't do with out one. . .while I get my original repaired. (I'll l likely sell the new one when finished my bottom balancing with little use). Hard lesson learned.