I try to elevate myself, the bed or use the wedge only when my GERD is a problem. I prefer to sleep flat and being elevated causes havoc with my back and neck. If it isn't one thing it's another.
I haven't heard of the bedge but it being longer sounds like a good idea to me. My wedge is of egg crate foam which I find to be pretty comfortable and I prespire less (being peri-menopausal night sweats are an issue). If I position my head at the very top of my wedge the bottom of it hits my hips. I'm only 5'2" so I think for most people it probably catches them in the waist.
I just wonder how comfortable any of these wedges are for side sleepers. I wish I could get myself to sleep on my back but I just end up laying there awake wishing I could turn over.
Elevating the head of the bed is really the best solution and if I slept alone I'd do it, even if it meant having to yank the covers up through the night as they slide off. I just feel it's unfair for my husband to have a rotten night's sleep because of this problem.
Hope that you find a comfortable solution.