I'm working on my first under bed TV lift install... hope to have it finished up tomorrow.
It's a custom lift from Activated Designs with an extra extension mechanism to push it out past the foot of the bed farther to clear a lounge thats placed against the foot of the bed.
Taking tons of time. The bed is a dual adjustable base that had to be welded up and modified with reinforcement to remove all the center legs and the foot of the bed had to be cut out and reupholstered to provide an opening for the TV to come out.
On top of that I'm cramming a bunch of stuff on the back of the TV (HDBT receiver, Apple TV, MRF-260) and also mounted a cheap Samsung sound bar/sub combo on the bottom of the 50" TV.
Should be cool when complete!