Have been debating this very issue myself. Don't have an answer as to it's worth but it's the only safe bet out there currently.
Saw a post on NAM where someone had the kit installed for $1770. or there abouts so sent a copy of the post with link to NW Mini asking if they could match the price. No dice! Maybe try to get enough people interested and approach NW Mini with a group buy and install party.
I already have a Milltec exhaust so all I really want is the ECU tune. My K&N drop in and cat back seem to work fine.
Hoping Jan (RMW) gets the Dimsport tune. It supposedly has been released in Europe.
Let me kow if you hear anything about the JCW or other tunes. A downpipe (with NO CEL's) tune, brake ducts, and slotted rotors plus some minor chassis bracing would make this guy a happy camper! (I could add more to the list but----------).
Cheers!