I've read about these in Mopar Muscle and MCG this month. This seems like a viable alternative to the dreaded Orange box.
The write-up in MM showed a comparison between the Revonator, a parts store Wells generic box, a functioning orange box ( Where the heck did they find one?) and a chrome box. The results were pretty impressive.
The Rev box showed HUGE gains between 3800 and 5000 rpms compared to the Wells and orange box. I actually have a generic parts store box in the Charger and the idea of gaining 50+ horsepower this easily is pretty tempting. I'm going to check pricing.