Well since no one else has weighed in, I'll offer my 2 cents...
I've been using a Mackie SRM-150 for several years now, and it works well for me- in certain situations. I really like the small form factor. The caveat is that I typically only use it when I have a monitor provided for me, am familiar with the sound people, and I know that they're competent enough to do their job at least as well as I am trying to do mine. The key is, I start with a good mix from the board, usually just my keys plus whatever vocals are around, and I use the Mackie as sort of a reference to balance out whatever else is going on around me on stage at the time. The Mackie works well for me because I might have a good monitor mix when the band starts playing, but if/when things suddenly get louder as they can, and do, I can quickly and easily get back to where I can hear myself until I can let the sound guy know I need some more keys in my mix.
There are Z-stand attachments for microphones, so you could theoretically mount one to your stand which, now that I think about it, I might have to try...
I also have a QSC 10.2 that I like to use on bigger gigs, when time and convenience allows for a larger set up. But I also rely on it when I don't know who's running sound, or when I do know and I don't trust them. It's about 3x the price and 4x the schlep, but it also sounds about 10x better, and I don't usually end up needing to bother the sound person with things like trying to get more keys in my mix.