Ross-tech's vag-com/vcds is extremely helpful in so many ways with these vehicles, as it does most of what the factory-level diagnostics can.
On the CR TDIs, it saves a lot of time on basics like a fuel filter change, where failing to do the job right can burn up a fuel pump. Besides resetting the service reminder, it can change the interval to one that works for you and not VW's default. It turns off DRLs, so higher output HL bulbs don't burn themselves up. It adjusts TPMS alert thresholds. That's barely scratching the surface of what it can adjust. The adjustments and features are far too many to list here.
We run a full scan every time it comes back from someone other than us working on it. And it saves us real money and hassle.
Last year, it caught a damaged heated mirror that the body shop (and the carrier's appraiser) failed to catch after a deer swipe. Identified which side and when the "intermittent" occurred -- to the kilometer -- so there was no argument about the supplement on the claim/repair.
If you plan on significant DIY on a VAG (or several) that you intend to keep for more than a few years, it does pay for itself. And MOST importantly, it keeps you away from the dealer.
Ross-tech is within driving distance of us, and I've met the staff there. At one point, I think the founder started out of his home across the street from their current location. Good people and a great product.