FYI, I'd recommend the Weller over the Hakko, for precisely one reason only: the rotating encoder, instead of the confusing pushbuttons.
If you can find an analog FX-888 (no D), get it! I was lucky enough to get mine when I did...
The operation and reliability of both units are comparable, and will last many years.
By far the most troublesome issue, is the same for any class of iron: proper tip care. If you have idiots using the iron, who crank up the temperature and don't use enough solder and flux, you WILL end up with a lemon: at the very least, losing a lot of time trying to tin the tip, and having to replace it often.
The same goes for desoldering irons, by the way: keep the tip tinned and clean. I've gotten strange looks, many times, from novice technicians: "what are you doing, adding solder when desoldering?!" If you can't figure out why this is a silly question to ask, you shouldn't be soldering.
Tim