[charlie bucket]

I use a (cheap) Paasche Millenium double-action. I can't vouch for any others since this is the only one I've ever used, but I like it plenty. I should probably upgrade though. Clean-up isn't so bad. One thing that will mitigate it greatly is using acrylic paints (Gunze Sangyo are my favorite) and then blowing a ton of water and isopropyl through it after every spray instead of expensive paint thinner, including blowback spray-cleaning, where you hold your finger over the tip and it blows water/isopropyl back through the paint cup.

It doesn't take an engineering degree to assemble or disassemble for real cleaning, which I have to do fairly regularly, but the first few times you do it you might end up adjusting the little rod inside wrongly or having poor tension on the action against the spring upon reassembly. Time will be the big key to familiarity, but that's true of most things. Just make sure the tip is always needle-point fine though. Don't try and force the rod into the chamber if there is resistance or you will likely get a little bend at the tip of it, which will result in all sorts of bad spraying idiosyncrasies. If you do bend the tip, it can be sort of straightened out with a pair of forceps, but it's best not to have to at all.

Clean up after disassembly involves pipe cleaners, hot water, again isopropyl, and a little patience, but compared to dropping model parts on the floor, inadequate kit fit, biplane wing assembly, and all the other delightful little hazards of modeling, it's very low on the scale of things that will make me send forth a salvo of unholy cuss words.