Sorry for the long delay. We did go to Bear Wallow back on Nov 11th. Unfortunately I've been so busy with work and life and holidays that I haven't had as chance to sit down and put my thoughts to how I feel about the tune.
I'll begin with starting and idling. My 570 feels like it starts and idles a lot easier/smoother than it did without, plus as I mentioned earlier at idle in my garage it doesn't smell as rich as the factory tune. One note about easier starting. While I had the battery disconnected to remove the ECU, I swapped the factory POS battery for a Gray Case Duracell AGM ( East Penn manufactured) which probably accounts for the easier starts.
On to riding. The first thing I noticed was an increase in throttle response from both a standing start and while rolling. In the parking lot at Bear Wallow from a stop I pinned the throttle and was immediately launched forward. No wheelies, but that was due to lack of traction. It did however spin and spin until I got out of the throttle about 40-50 yards later. On the trail from a roll there were a few times coming up to a hill that I truly let it eat. From past experience, prior to the stage 1.5 tune, doing the same thing the acceleration was acceptable and I'd gain stream heading up the hill and top out around 35-ish at the top but nothing exhilarating. This time, same hills I would let off at 45 and coasted the rest of the way to the top.
Other observations. The day we rode, the air temp was about 65. Maybe it was my lack of paying attention, but I didn't notice the cooling fan coming on as much.
Overall I am more than happy with the results. Next spring and summer will be the real test. We've got a couple day HMT trip planned in the spring, along with our annual week long trip in July. The only things I plan to change between now and then are new tires -GBC Diet Commanders are not ideal for 99% trail riding, and I'm going to order a pair of R2C air filters, one for my 570 and my wife's ETX.
Hope this helped anyone who may be on the fence about spending the money. I don't regret it in the least.