Although I'm not familiar with Ultra spray, I would think you'd be just fine with it for your specific application - only concern I would have would be the potential for "glare" given the name Ultra spray.
There are, obviously, a bunch of other products (303, Adam's VRT, Poorboy's BnB, ArmorAll, Megs, Klasse, Zaino, Z1, etc.) each somewhat slightly different in function and look but all basically the same. One thing to keep in mind is whether the application will be exposed to the sun - if the exposure is direct and severe (such as your main dash), you'll want a strong UV protect such as 303 or Adam's VRT and not too much of a shine which could cause glare for you. With your application, the UV consideration should be minimal and the TurtleWax should work just fine.