I've been using Daves v2 tune since September. Stock 2010 SE, bike master filter, modified dog bone only mods.
There is a noticeable increase in midrange power and snatch is much less noticeable. This is why I have kept the tune- thanks again Dave!
The understandable downside is a significant increase in fuel consumption and decrease in range.
With stock tune I got around 35mpg, the yellow low fuel light usually appears about 135 into the tank.
With Daves tune fuel consumption is closer to 30mpg. Yellow light on with only 110 miles on the trip odometer.
Your mileage may vary.... Most of my riding is back and forth to work or just messing around on two lane roads with lots of stops and starts, lots of braking and acceleration. On interstates the mileage is closer to 35mpg. Gas is cheap in the US, particularly now, and the Tiger is just too damn much fun to ride meekly. If I wanted to save gas I'd buy a Prius.... Or ride my KLR650
Enjoy your Tigers my friends!