I haven't personally shot the React, but I've held it and looked it over pretty closely. While I love the SmartPin technology I can't help but wonder why they didn't fully protect the fibers on the back of the pins. They're completely exposed and IMO don't seem to be too securely held into place. If it wasn't for that one thing, I'd probably have one my bow by now.
Hopefully they release an updated version for next year, I'd love try it!
Also, a few folks I've talked to said they had better luck with accuracy by sighting in their 20 yd pin and then their 50 or 60 yd pin. The pins in the middle of those ranges then drop into place and are a little closer to spot on.