I think you're absolutely right. They've been hiding in the shadows of peer-to-peer referrals for a while but now they've got a real marketing campaign. Not to mention that several companies are at similar stages -- the market is getting interesting. The biggest selling point in my opinion is the ease of purchase. Since the foam can be vacuum packed and shipped via FedEx there's no more dealing with mattress delivery scheduling and finagling through hallways and staircases. My own mattress is in good condition but I look forward to what things will be like come time to replace it.
I too use a similar setup with an Emotiva UMC-1, QSC RMX 1450, Mirage Omni 550s and a Pinnacle Baby Boomer. To be quite honest, a few of the decisions were based on emotion, others on what was cheap or what I already had. I love the setup though, it sounds great and gets louder than my room can handle while staying very clean.