A tool truck came into the dealership and sold all my techs on the micro start. One of them drives our wrecker and takes it on all jump start calls. I grabbed one of them to jump start the owner's 56 chevy that was dormant for over a year and wouldn't start after attempts to charge it. The 56 would stall out after I took the micro start off of it. So it was small enough I hooked it up, he started it and I just left it hooked up for him to drive the car back to the shop about 5 miles away. We've jumped diesels with them, from a duramax to sprinters. None of my tech's units have failed yet and it's been almost a year.
One of my guys found a simple unit without all the attachments at wally world on sale around xmas for $55 and grabbed one for all his kids. Bought them all out. He found more on clearance a couple of picked me up one. A little smaller in size but so far it does the same job.