I bought some about a year ago, and love them. As Jack had suggested, I also bought mine from Costco. I think I saved somewhere around $400 on mine. It helped that I purchased mine around Christmas, so that it helped me save a bit more money as well. I think the only downside I can find with the product is that they are a bit heavy. I guess that is to be expected, but it was a bit of a surprise since I wasn't sure what to expect.
For me, storage was a bit deal because I don't have a ton of space to work with. Quickjacks sells hooks so you can stand them against the wall. If you are cheap like me, I just 3D printed some hanger for myself so they stand straight and take up less room. I also did the same thing for the hoses, and made a hook setup for them.
Overall a great product and will likely never go back to a jack and jack stands. I would recommend going for a higher rate capacity if you can, as I have found it useful; meaning 5000lbs over 3000lbs, or 7500lbs over 5000lbs.