I currently have the wireless version and have been very pleased with the performance it has produced. The best way I can put it into perspective is to say my car has awakened out of hibernation. It is by no means a road rocket but it is about 150% more fun to drive. Much less turbo lag if any at all. DSG seeks the "proper" gear less. Much better throttle response. Not much smoke even at WOT. Satisfaction factor increase. I drive fairly hard so I'm only getting 36-38 mpg, I was getting 39-41 pre-box.
My previous car was a 2001 TDI with RC 3.1, OMI, PP520's, and a 12mm pump head. It would pull like there was no tomorrow and was a blast to drive. However, in the 90,000 miles of mods, I went through two clutches, this is probably the only gripe I could ever have about "playing" with my former TDI.
I am a district sales manager with a national food distributor and drive 500-700 miles a week and will probably have a TDI as long as I peddle green beans. I put over 150K on the 2001, the only thing I had to replace on the car besides the clutches and regular maintenance like timing belt replacement, was an AC compressor. A great track record IMHO.
For me the DigiPD box is a perfect solution. A great level in increase in torque and horse power for the ease of install. Preservation of my warranty, huge factor for me. The ability to adjust the level of perfomance you desire by popping the hood is another plus as well.
Moving from a highly modded Jetta to the stock 2006 was a shock at first, kind of scarry merging onto the interstate in the beginning. I at first hesitated ordering the box and wanted to stay stock for awhile just for general principle reasons. I weakened one day about 2 months ago and ordered it. Would I do it again? You bet and I would order it on the same day I purchased the car.
Cost might be a little strong but I guarantee you if it were a "Package 3" option offered by VW it would cost more than $600.
Oh yeah I almost forgot: Setting "F"