"It's all right, nothing spectacular about it"2.5 starson by cd.12117
Pros: It's a small unit, so it's easy to carry around.
Cons: The instructions are on a tiny piece of paper- it's very easy to lose. And the charge time is an estimate, there's no way to time it. The internal timer is 8 hr, which sucks if you need four hours.
Summary: All aspects considered, this is a small unit if you need something decent. If you want something more efficient, I would suggest researching a different unit.