I haven't noticed any myself but I can't say I've been looking. The only draw towards no DPF is that my tail pipes are a little sooty now... but I don't care. My previous Jetta was the very same way and smoked like a freight train. I just wipe them off when I wash the car (once a week) and they are good for the next week.
If I had of been smart (and a little more daring) I would have done it all at the same time. Very worth it as far as I'm concerned. One less thing to worry about down the road also.
And yes, he is off of Spears Road.