[Halon]

I run one but I only drive in the summer so can't comment on it's cold weather performance. If I let the car sit for a couple weeks, the battery will be dead. I also run a sub so I'm sure that draws a little extra and probably doesn't help anything.

As for what the different models are, I'm not certain, but I thought that some of them were just the battery, and some of them included a little metal casing around the battery, hense the different part number.

Also if you search on here, I know I put a link a year or 2 ago somewhere on this site, of the cheapest one I had found that was just like the Odyssey. It wasn't the Genesis, but some other brand. Try doing a search on here and you might find the link. I was planning on using it, but I bought a JMF kit in the end which included the Odyssey so that's what I ended up with.