I just signed up for it, for the top level one (since it lets you filter by seller) and got some interesting info on one of my competitors
It's all info that you can dig out by hand, but is sooo much easier than doing it by hand. I dunno if I'd recommend signing up fulltime, but for the moment I'm using it while it's cheap to get a better look at competitors (full version isnt free, but do get discount for these two months).