I absolutely love 1Z Cockpit Premium. I would have to say that it is my favorite and "go-to" interior detailer. It does offer some protection, but not much. The best thing about it is the fact that it leaves a factory matte finish; no greasy, glossy look.
I have a convertible, so I need UV protection. After consulting with 1Z USA, they said that while Cockpit Premium does have UV inhibitors, it was not really designed for that because the windshield filters out most of the UV light. Of course, this doesn't apply if you don't have a top, so I've used Ultima Interior Guard Plus to provide the UV protection, while still using Cockpit Premium for cleaning since it has a pleasant scent and matte finish.
My second product that is "all-in-one" would be SONAX Dashboard. It is just like 1Z, however it foams - which could be a plus for deeper cleaning with a microfiber towel. Between 1Z and this, I would probably choose 1Z, however it is an excellent choice, especially if you get it in one of SONAX's packs that contain Full Effect Wheel Cleaner or Glass Cleaner (which is my favorite glass cleaner.)
1Z also makes a protectant. It was designed for exterior use but can be used on the dash and wiped down for the desired look. It has all the protection you could want. For heavy cleaning, you'll be hard pressed to find something better than 1Z Deep Plastic. I use it all the time, both on the exterior and interior. It is truly a fantastic product.
Hope this helps and happy detailing! :rockon