I don't like using the portfolio case around the house. I do use it when I take the Xoom for a walkabout.
I was surprised that the strap doesn't interfere at all. Still fits nicely in the portfolio case. Just used it this morning.
I had a period where it seemed the portfolio case might be causing overheating. The lower right corner gets warm, especially when running videos. At one time the Xoom was acting up and when I took it out of the case the problems went away. So now I only use it when I go somewhere.
And, around the house, the strap is great. It was a lucky angle I picked. It works to hold it in portfolio view with either hand and in landscape with my left hand. lHolding it with my right hand under the bottom a couple of fingers slip into the strap also.
I hadn't really expected it to work in so many positions. Got lucky for once and it worked better than I expected.
Super Glue won't hurt the aluminum back.
It certainly wouldn't hurt it as much as dropping it which I've almost done several times. Dunno why they make them so darn slick. Well yeah ... they sell more that way when people drop 'em