Thanks everyone. I discovered yesterday that I have one of these easels -- it's a Unicolor 8x10 combination easel that does 7x10 on the backside. My darkroom is cramped, and I like the small size of this easel -- also the fact that I don't have to deal with blades or masks. I'm not in the habit of printing every image differently. I never crop for composition (and, in fact, if I had that filed down negative carrier, I'd be tempted to use it). This suits me insofar as it gives me a slightly larger image than the 6x9 I've been printing and still (mostly) keeps the 3:2 format. Maybe I'm being fussy, but I don't like 8x10 except maybe for portraits -- and I do most of that work with medium format (square).
Sure, the answer is always "do what suits you." But if I ever decide to sell prints (or, more realistically, if someone decides they want to buy them) will I wish I had put a full border around the image or used a more conventional sized frame?