I bought two of these to use as additional on-stage monitors with my PA (Mackie desk and Nexo apm and speakers).
The SRM150 is a pretty versatile beast as far as input is concerned, and I really like how it handles, and also that it does not need a wall-wart.
However, I found it a tad under-powered for my needs, and also was not over the moon about the quality of sound. It is perfectly OK, but compared to my main monitor (an AER AG8) it sounds boxy and a bit shrill.