Meguiars Last Touch is a great QD spray.
Comes in a US Gallon container (4.5litres ish), so you can fill your trigger spray to your hearts content
Mixed 70/30 with filtered water you'll get about 13 or 14 trigger bottles full out of the container. Its about £18, so is worth considering when you think a 0.5litre QD spray will cost you a fiver at least.
At the moment Last Touch is my favourite product for the car. Leaves it really glossy and smooth. Like Rich says, just like a wax without the hassle. Its simply a spray on/wipe off. No residue, doesnt matter if you get it on trim or anything.