My Mum and Dad had a dual control one, which was a life saver for Dad as he had emphysema and couldn't breathe lying flat. Mum loved it as she could change position depending on whether she was sleeping or reading or whatever. At the end of her life, when she had cancer, it also proved very useful as it gave her the independence to get in and out of bed unaided for far longer than she would otherwise have been able, and also it supported her when she became pretty much bedridden and wanted to sit up to chat with visitors. It's years ago now, so I'm not sure what competitors are like, but theirs was from Adjustamatic and had a brilliant built in massage function. This is the Adjustamatic website link that i just googled.
www.niagarahealthcare.co.uk/adjustamatic-beds