Give it a try, I think you'll like it.
I don't really use future to coat entire models. I use it mostly with a brush to coat small areas to make a good surface where decals will go. Keep in mind that future is self-leveling. This has several implications when using it. If you put it on too thick it will puddle in low areas. With thin airbrush coats you probably won't have this problem.
You don't need straight ammonia to clean with, Windex will do just fine but clean your airbrush as immeadiatly as you can.
I could add lots more but you'll get plenty of good tips on this topic. I look forward to following this thread myself