I have one that I bought from Advance Auto. I've had it for 5 or 6 years now & it's still going strong. I don't recall the brand off hand.
It has saved my ass and others a few times. I did have to use it on my waverunner once. I put it in the water and it didn't start.
The biggest complaint I've heard is they don't last. I guess I got lucky. It didn't cost anywhere near $100. Maybe half that.
Danny