So longevity is good on this unit as I've been using it on and off for a year plus now. It's small, charges up a car battery just fine (even from completely dead). The only thing I decided I didn't care for after the fact were the circular attachments. Originally I thought I'd just mount this somewhat permanently to a vehicle I had sitting mostly, so tried mounting these with the main battery lugs. They were a bit too large in circumference to do that, unless you just lock down one part of the disk. However, I'm sure you could rig something to work like this using a washer or something. Anyway, I ultimately did not end up using it that way, instead using it as needed, grabbing it off the shelf, looking to hook it up to a battery right quick. Well, how do you do that? In this instance, I'd prefer larger alligator clips to ease and speed of hook-up. Keep that in mind when purchasing this item.