It's hard to say much about the ECS-10 now, before they've even shipped one to anybody. You do have the 30-day return policy with Outlaw, and a little sub like that (even at 50-odd pounds shipped) isn't likely to be a major expense to ship. There have been a number of very successful little subs like this, so the small size doesn't worry me. On the contrary, that's the whole point behind the sealed approach (and a big part of the reason that the ECS-10 costs so much more than the LFM-1 Compact).
Power alone means very little - power must work with the rest of the product. I would counter SVS's comments with the following questions: was that 1000-watt sub amp being fully used, and what kinds of subs were being compared? Compare two subs that only needs 300W peak, and the fact that one has a 1000W amp will not give it any advantage. Similarly, take a ported sub (which generally needs less power in the first place) and compare it to a sealed sub (which generally needs more power, all else being equal), and the low-power sub can still "trounce" the high-powered sub due to the significantly different designs.