Seriously though, is there any appreciable difference in this application?

it's a conical, rubber nozzled that fits the end of the air blower attachement...

It's all I have ever used and I see no negaive impact of using it. Never scratched the paint!!!

Only thing better was when I used to vacuum it instead of use the compressed air..

compare its gloss/depth/etc on Santorin vs. Blitz and/or P21S?

I used Zaino for a solid season, and have yet to get results as good.

I was a Blitz fanatic for years. The Zaino was as good as it got, but I still needed to use IP & FP prior to Z5 to get the results I wanted, so after a brief conversation with another S4 owner, who raved at the ease of application and the depth of shine of the other Menzerna products, I gave them a go.

They weren't wrong..

Again, the result with Zaino was top notch, but I can do a coat of FMJ in about twenty minutes, in the dark and get 95% of what would take me dramatically more time with the Zaino.

I just had the head of the Audi service department ask me to detail his bike because, as he put it "that paint is better than some of the '05's comin' through here...".

I still use the Twins as needed.

Depth is excellent. Durability is reasonable given I don't garage my car. Shine is top notch.

Pretty much everything else is sitting unused.. IHG, IMG, GEPC (got a full bottle I never opened), Blitz (two unopened cans), #7, Zymol Carbon...I should have a garage sale. hhhmmm...I could put together a great starter kit for a noob detailer, with the stuff I don't use anymore...

...now if I could repair leather...

that vs. the Zaino, but dislike the whole mixing/chemistry thing with the Zaino & cure-accelerator. I'd much rather just open a bottle and go, especially when I'm on the clock with a customer car.

I'd've been willing to take the GEPC & Blitz off your hands, but I have some in shipping right now :*(.