so the lab we work in got a really nice JBC soldering iron yesterday and holy crap is it nice to work with
the cheap weller one we had before doesn't even begin to compare
we can change tips without having to wait for it to cool down, it provides a _ton_ of heat to easily solder to big ground planes (it can solder a massive 150-amp rated tab to a super-thick double-sided 4oz copper plane with only a minimum of trouble), and it has really nice specialty tips
of course you pay for this quality, the whole thing cost a total of like $1600 compared to the cheap weller's <$100 but it's not our money, it's the school's x3