This is a very good solution if you don't want to go to the lengths or cost of a full AV amp + speaker set up, but want to improve the usually poor sound on flat panel TVs. The professional websites will give you all the technical details etc, but as for actually using it in practice? + you need to be sure it's suited to your set up, so buy it off line in a shop unless discounted enough.
It certainly makes a massive improvement to the sound - the neighbours may not agree! My living room is quite small and I didn't want speaker cables trailing everwhere. + I was going round in circles comparing the specs and reviews of various amps. So kept in simple - the PS3 and TV do enough 'upscaling' etc. for an amateur, + a decent ipod dock finishes off all my requirements. I have it connected up to an LG 32LT75 (not a recommended TV - great concept but too many bugs - keeps freezing!), which only has an optical out for sound (no headphone socket). All other equipment is connected to the TV - currently PS3, PS2 and Camb Audio iD50 dock - and the only link to the speakers is the optical cable. I guess most moderate sized TVs will be the same as mine, with nearly all connections sticking straight out of the back rather than pointing downwards, so you will need to use the spacers included to create enough space between TV and speakers. I had to find some extras as my aerial socket was right in the way. Using the spacers shifts the weight quite far back and will slightly tilt your TV back if it's on it's own stand.
I guess it is just the technology involved, but it's only if you have the TV connected up through it's headphone socket that your remote will directly control teh speaker volume as well. Using the better quality optical and component connections requires you to use rthe small speaker volume remote provided. This is simple and solidly built, but it apears the sensor is inside the left hand speaker and has a narrow field, so you need to be pointing the remote directly at it to get a response. The volume changes in quite large increments as well.
Alternatives? the Onkyo HD22 is one option for a 2.1 speaker system, but the speakers will take up space. If you have a headphone socket an inexpensive and reasonably discrete option might be Audioengine A5 speakers, I think designed more as a docking system but might provide a solution until other options available.