If you are talking about a genuine station, there are good and bad things about them (as with most stations). But the things you need to know up front is the fast change tips, tip selection, heating speed and power.
The downside is they are expensive to equip out with an array of tips (as opposed to something entry level like a Hakko 888D). So some of the advantage soon balloons into more expense (this may concern a hobbyist more than a professional to a point).
Owners of them have commented about tip durability and personally I passed because of the handle and the display angle. I'm not a fan of blue LCD displays (always seemed like a consumer gimmick).
I held out for years and went for the Pace ADS200 when it came out. It is a very different station but has advantages for me over the JBC, lower price tips, accuracy, construction, ease of repair, detached stand, optional tools (e.g. tweezers to be released).