I've got the HF jack, and it works well for small jobs.

I'm stocking parts for major work this next winter, and one of those will be the J&S jack. I've seen it in person with JaronB's ride on it, and it's just ****. Will be what I use to do major work on the bike.

 

I had to replace the bottle jack in mine and you have to order it via the phone as they don't carry them in the stores nor can you order it on the Internet ($24 to my door). I think my original bottle must have been bad from the start as the new one is way better than the original ever was. Used it this weekend to change the oil, works like a charm. If I lifted my bike frequently I would probably look at a j&s but for what I do this works just fine.