I started off with a Cambell-Hausfeld unit. A membrane pump and a decent handle. I stored it faithfully by pumping a quart of regular Varsol (mineral thinner) through the unit. I replaced the handle with a newer, nicer Titan unit and fell in love all over again. I bought an assortment of tips from a Titan dealer who decided he'd stop dealing with 'professional' painters and to focus more on the tofu-sucking/Birckenstock/Tilley/Volvo crowd. I ended up with a dozen 515 and 520 tips. The 20 worked a little better with the heavy ceiling stuff.
Then, I developed a problem with the pump.. it became even noisier and started to surge. Then I bought a Titan piston pump. I only used it twice. Once to spray a stalectite/stucco ceiling, and once to the interior of a garage where my toy sleeps. The 1-1/2 car garage took 45 minutes to paint EVERYthing.
I find that a solid footing is required when on a ladder as they do give a bit of a thrusty kick. I have used the Graco air powered pumps as well and find those just amazing, but stupid money.
The word around here is Titan.
By cutting in and using a blast shield on a stick (Ends up looking like a small snow shovel) I find the fan's edge very clear to see.