I'm actually using it for Step 2 now. I can keep you and anyone else curious updated every now and then. Right now, here are my general comments:
-Honestly, what they have now is pretty crappy. The biggest thing I'd say is that the topics mostly seem like they grabbed Step 1 topics and mashed it in with Step 2 review books with minimal synthesis of a new unique product. I'm also "never see again"ing like crazy compared to Step 1, partly due to poor repeating Q's but mostly due to low-yield or "duh" info. There are also old problems like using acronyms in the repeating Q's so you don't know what they're referring to and repeating Q's on low-yield stuff.
-A good thing about the current product is that you can feel pretty secure that the information you need to know is there. It's more of a problem of wading through the significant amount of unimportant stuff than not having any good stuff there.
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Why I would still recommend it if you really liked it for Step 1: They've been actively going through and making huge strides in updates. These new topics are worth the money. They live up to the Step 1 standard in my opinion so far. They have a
weekly blog post where they post the topics they've updated. Their goal is to completely revamp the Step 2 content by the end of July (ehhh seems unlikely). You could actually buy the product now and simply let the blog posts lead the way in the topics you flag -- it's enough work to keep you busy per week.
For those on the fence about Firecracker or who bought it and didn't like it in Step 2, I don't think anything's going to change your mind about their Step 2 product. My advice at this time would be to hold off.
For those interested in jumping in and who didn't use it for Step 1: Consider following
their blog and doing only those topics as they update the content.