(1) Of course it comes in as single audio. That's a good thing. For example, I'll often use UM1 wireless mic w/lav in conjunction with my Sennheiser k6/me66 shotgun. I'm assuming you're going to take your footage into editing at some point, in which case getting a single channel to pan out to stereo should be no problem with most setups.(posted 9016 days ago)(2) It's a wireless lav mic that costs under $600... expect some interference. That's one reason why I usually double mic with a shotgun mic. Considering the price, the mic offers pretty good performance. Of course, a wireless lav regardless of quality is never going to be as clean as similar-quality wired one.
-- John