Feature:
very versetile. there is low cut, high cut, and room control switches for different applications and cross overs. One of the things i like is you could turn up or down the LEVEL on the subwoofer and it makes no change in the volume of satellites. Thats good for when you want to know what your mix would sound like on a system without the low frequency responses.

Quality:
Extremely high quality. As accurate as I've heard in my life!

Value:
its worth the price if you value music.

Desirability:
without this sub its like hearing my mix just the mid and high. It kicks beautifully smooth.

Sound:
Rich bass i like the response especially if you pair this with hs50m or hs80m you'll have almost the full spectrum.

Ease of Use:
cant get any easier than this! plug it and it will rock your studio!

Overall:
if you're serious about producing i recommend this product.

Feature:
good basic hookups and controls. missing a mono input (i know, i know you can hook up one side). also missing the control input of most high end yamaha prosumer subs. a PITA when using the sub in a 5.1 simple home theater system. i really like the size and appearance given the performance.

Quality:
well made for the price point. if you are gonna slam it and move it i would opt for the mackie.

Value:
it is worth the price and zzsounds is the place to buy it and anything similar. i have bought from zzsounds since their first day up. i know some of the early principles of the company and they are basically good guys. you can do easily much much worse.

Desirability:
yamaha has made some outstanding gear and some real dingers. at their best (high end home theater gear) they are a bargain. at their worst (any speaker outside of the old NS-10) they can be pretty sucky

Sound:
good basic sub that has some serious competition from velodyne and mackie. great deal at $350 for stereo pro connection level sub.

Ease of Use:
simple is as simple does

Support:
with 5 being average yamaha is slightly above average since their gear is so well documented online. however it is a real PITA to get some info from their site since you have to "join" and deal with the associated spam point.

Overall:
i usually keep gear like this until my other gear is upgraded or something comes out that is clearly superior. you will keep and enjoy this sub for many moons.