Well, I got a Touch Pro to play with, and the 2 into 1 usb cable DOES make a difference with
nueBattery installed. It actually provides about 10% more amperage (is that the correct term?) than my OEM HTC charger, and about 20% more than a single "nueBattery boosted" USB cable. Also, it seems the Titan just doesn't know what to do with the additional available power for charging, and both devices downshift the charging rate as the battery gets closer to full. So, if you've got one of these cables, it will charge a bit faster with nueBattery, but probably not worth buying one for it's own sake.