I got a 3M Accuspray system Link
] as a Christmas gift, after a "subtle" hint.
I've used it for spraying primer so far, and it has worked well. The kit I got comes with 4 nozzle sizes and a starter supply of the PPS liners and lids. I just bought some "mini" (6 oz) liners and lids, which should be good for small jobs. The cleanup of the gun is real easy, only needing a couple ounces of solvent, although with the liners and lids, the expense is a little higher as they're one-time use. I can see the easy cleanup as a plus for the occasional user.
I did have one glitch. The first liner I used had a leak and I wound up with unmixed (fortunately) primer on my work table, so I'd suggest checking them before use if you go that way.
I would recommend that system. Not that expensive for the kit, but as I mentioned, the cost of liners and lids is a bit more. May offset the use of cleaning solvent though.