I got flashed and de-clunked yesterday and I'm very happy with the car. No hesitation, no clunk, no problems with the dealer, Capital Mazda in Cary, NC. They gave me a Lincoln Town Car as a loaner.... what a big fat car.... I drove it for 2 days and when I got back in my MSP, it was like being in a go-cart on steroids.
After re-adjusting to having my car, I did some fun spirited driving to see how it'd react. It's perfect. It handles better and there is no hesitation. It seems just a little peppier as well. It feels more 'ready' somehow. Passing people seems slightly quicker.
I may go to the track tonight to see if there's any real changes. I just went 2 weeks ago and the conditions are similar today.