I ordered the full size for our guest room.  Up and down whisper quiet. Mechanism and remote seem long lasting.
Easy set to, screw legs on, plug in, add mattress and you are all set.
Arrived in one box, fully assembled. Remote has clip to attach to bed frame.
I have a hybrid mattress (has a few springs) and it does bend if you are lying on it with two people, but I would recommend a foam mattress for ultimate comfort and mobility.