I use it and it's great, definitely recommended if you need the extra height as I did to in hitch.m even with blocks I had to crank my tj almost to the limit to unhitched. Any sort of slope and the block height was too much for my liking (over 16"nine some cases),I got the taller version and it solved lots ofmissues.
Mine is called a flipfoot. It works really well. I paid about 50 bucks for it about 3 years ago. I no longer have to crawl around the back of my truck looking for my wood block. Nice. We use our trailer a lot and I still don't see any wear on it, not even any rust. I highly recommend it.
I went out to buy one two days ago and the parts guys advised me not to get one. He said he had one and he called it a power jack buster. so I didn't get one.
Similar one came on my Atwood electric tongue jack. I like it but I still should put a block down under it because my trailer tongue is high and the jack has to be extended all the way. Works great for me as long as the wheels are properly chocked so the trailer will not move..