I have
this one under a different brand name. It works great.
In fact, just a couple days ago, I needed it to jumpstart my SUV in the morning. Then at lunch, I used it to jumpstart a co-worker's car. I have used it on my clipper before also. I've had it a couple years now. When I bought it, I looked for one with the most cranking amps and the highest mah capacity so I could jumpstart at least twice on one charge.
We have the "really good" ones at work (per my engineer boss), but mine has worked just as well and weighs a lot less.