Lots of plusses... you won't be disappointed, that's for sure. My only negative is that there have been a couple of companies out there that have been threatening to produce an intercooler for hte 5oh and Blowzilla. Not a single one has made it to market yet. This is largely due to Kenne Bell jerking everyone around with their sales policies. They no longer ship their units to stores that want to keep them in stock. The result is that they're seriously limited the potential for resellers to make money on sales and installs. When customers have to wait for something to be shipped directly from KB instead of being bale to buy a kit off the shelf, they usually do something else. Hey Kenne Bell... if you happen to come across this thread... pull your heads out of your buckets!
Product wise... it's an awesome thing. I like it so well that my stock block will soon be retired in favor of a 331 specifically built to take full advantage of the KB. It should be a lot of fun. If you have specific questions, I'll be more than happy to answer them. I believe that I also have a pretty descriptive reply ready and in the can in my sent items here, if you would like for me to forward it to you.