I had the Epic Grand Master 500 for a little more than a year, and for the money, I felt it was truly a nice sound system and one which worked effectively for music and movies. I would recommend upgrading to the 22's and the 150 as oppossed to their smaller cousins you are asking about...
I still use my 22's as rear speakers and have uprgraded almost everything else since having a full axiom speaker system. Demo's are hard due to their internet sales, but it's worth a leap of faith. They do accept returns (I sent back several pairs of floorstanding speakers) although it was a hassle.