IMO, if your going for just rock bouncin i'd go with the LoMax. 95YJ on here had one at one time that he wanted to sell if your looking for one.
I have a Stak in my buggy and love the two ratio's. It's really nice to have the 5.4:1 for easing through the technical **** and the 3:1 to get back and mash on it. However, mine pops out of 5.4:1 right now and thats ghey. I am waiting on a new shaft from cncdude04 on Pirate to fix that issue. Think about 3 more folks have to sign up for it before he makes them.