I swear by my J&S jack. I bought the jack, oil drain pan and t-handle that they offer. It seemed pricey at first, but I use the jack in my garage after every ride to turn my bike around 180*. It saves a lot of hassle. The stability under my Road King allows me to work with confidence.
After a couple of oil changes and engine modifications, it has more than paid for itself (saving me some dealer costs).
The customer service at J&S is first rate. I did have to replace the bottle jack due to a leak and a new one was sent out promptly with no problems.
With the lifetime warranty on the frame, this will be the last bike lift you will have to buy.
Just my experience.