I have some really old M1's that aren't powered. I like them alright. But, I'll tell ya, I've heard my speakers in an A/B comparison with some mackie powered monitors and the difference was night and day. I liked the mackies better but alas, I can't afford them. Alesis makes good stuff though. I'm a devoted Alesis customer. As for the powered version, I wouldn't mind having a couple.
Later,
Chris