2 years ago I picked up two complete Metcal units, that's the power supply and a new hand piece for less than 100 bucks each. Took a month or so of watching ebay but when someone cleans out an electronics shop they sometimes price it to just get it sold. Tips come in dozens of sizes and I've done well buying assortments of used ones.
I just looked, my power supply's are model PS2E-01, that housing is a massive aluminum extrusion, very high quality. Heck, everything about Metcal is high quality, these were designed for soldering 24/7 and were built to do that.
Not that I would ever need to do it but if you had say 20 decent sized solder joints all lined up, this will do it without slowing you down. I mean like 1/2' apart so your barely moving the iron. The induction coil is wrapped very close to the tip so it just pours on the coals so to speak.
BillWojo
BillWojo