I use the Delta 18-36. I like it because it has a fixed sanding drum and a moving conveyor, which seems to me like the more reliably solid approach (as opposed to a moving sanding drum and fixed-height conveyor). All the widebelt-style sanders have moving conveyors.
I further improved the machine by enclosing the "open" end with a custom-bent 1/4" thick aluminum plate, which greatly improved the rigidity and efficiency of the machine. However, even before this mod, it was a fairly solid machine and I've done plenty of work with it.
I just saw another builder sing the praises of the new Supermax machine.
It has the moving drum design that I don't prefer, but he said it was very rigid/accurate and, in his mind, a step up from the Delta he'd had before.
For solidbodies, where the thicknesses are not as critical, any one of these machines will be adequate. For acoustics where you're targeting thicknesses to tolerances of .005" or less, you have to be a bit more fussy.
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