I bought this because I was worried I wouldn't hear myself sing at my friend's gig.
To that end, this product works very well. I used a pair of Shure SE215-CK's and was able to enjoy a mix just for me, letting me hear my voice clearly. Listening to recordings of the gig, I am pleased with my vocals and it is all down to this product.
I like how easy it is to set it up and get going. It weighs very little and is not a bad looking unit from a distance.
As for cons, it does feel plastic like and doesn't look that great up close. I did experience some interference while I was waiting in the wings, but once I got on stage I had no issues. My primary concern was proper monitoring, to alleviate my anxiety about singing out of tune due to not hearing myself properly.
So, all in all. A great package for the price asked. I just wanted to hear myself sing in a noisy environment, and it delivered. Looking forward to using this in my upcoming gigs.