Coke and Xanax are nice together. The Xanax takes the edge off the coke. I wouldn't say it's trippy in any way. It's cleaner. More pleasant.
The one downside is that, in higher doses, they tend to bring out the worst in each other. If I'm on too much Xanax, and I've done enough coke to keep me up, I tend to get mean. Surly, quick to get after someone. Otherwise, yeah, they're a good combo, IMO.