I got a free month with them a while back. I did not like it at all, and find it hard to imagine anyone would see the value in actually paying 20 bucks a month for it.
From my recollection, there were only a couple of tournaments each month that were worth playing - and those would draw several thousand players, watering down the pay-out pool.
This was more than a year ago, so the details are fuzzy. But in general, I recall thinking the entire model was pretty ridiculous.