I've thought about it, but decided that I needed to be honest with myself: I will *not* be good about bringing speakers back in, or I'll end up not bringing them out in the first place because it's too much of a pain. So I'm going to use outdoor speakers.
If I ever find an incredible deal on a pair of M3ti, maybe I'd risk experimenting to see how they withstand the elements. The placement is inside a screened in porch, above the top of the screens , so they won't get direct rain or sunlight. But they will clearly be subjected to high heat (this is TX after all!) and moisture/humidity.
Let me know how the M3 work outside.