Yeh, twice both in biz. First one was a while back ticketed by BA in Milan, the oneworld global explorer which allows three stops on each continent.

Took about seven weeks and started from Linate to BUE (BA), JFK (AA), YVR (CX), HNL (QF), MEL(QF), AKL (QF), NRT (CX with overnight in HKG), KUL (CX with overnight in HKG), BOM (via own way to SIN and then QF) and back to LIN (BA). Also stayed overnight in HKG twice as transit stops.

I had an AMAZING time and met up with friends enroute, or just got talking to people. At one point I did feel "Oh not more sightseeing again" but you much you enjoy your travels depends on what effort you put into it.

Second wasn't issued on a single ticket but 3 one way award tickets on LH and CX. Started from Dublin to LAX (LH) to HKG (CX) to CMB (CX) to BKK (CX) and finally LHR (CX with overnight in HKG) Again, terrific fun. Award tickets are great in that they allow combinations that paid ones don't allow.

I wouldn't hesitate a second to go again. I'm curious about the Star Alliance offering as it'd give me the chance to try SA/TG's biz class. If you've got the time, money and willigness just go for it!