I have their "entry level" LPA-1 amp driving my 4 ohm Onix Ref HT speakers with 2 channels powering a 5-room distributed audio system. The build quality is ecellent at over 60 lbs. and has no problems driving all my speakers.
Their new XPA-5 amp is also very popular due to the great price and performance (5x200 Watts, $800) They also have some higher end models with class-G monoblock designs.
There is plenty of user feedback and professional reviews on this site and you can also get plenty of feedback on the emotiva forum. You might consider a 30-day trial on the emotiva amp in question for comparision against Rotel, Parasound, Outlaw, or others at your local dealer.