I needed assurance monitoring for use on the road, and for the price these are very decent.
1) Sound
Sometimes to my ears sounds a little compressed, but this is probably some kind of loudness system for better bass response. Not an issue for my use though. Although I wouldn't advise these for reference monitoring use. They are even loud enough for PA'ing a of up to 25 people.
2) Build quality
Build quality is very decent. There is a grill to protect the front speakers and all the connectors are of decent quality. There are bass ports in the back, also convenient for carrying or moving them.
3) Connectivity
It's possible to connect 1/4" jack, RCA & USB, so everything from computers to a P.A. mixer are easily connected, direct XLR connectors would have been nice. Connection to the second speaker is done by a proprietary speaker connector. Maybe some standardised connector would be better but i guess you can't have everything, certainly not at this price point.
Summary: All in all a great buy for on-the-road use. Just don't expect it to be a studio monitor.