had two in the past year or so:
SFO-BOS on a pmUA non-p.s. 757, "loss of glideslope indicator" (channel 9 was on throughout)
KWA-KSA on the island hopper, winds/visibility
both go-arounds were executed above 1000', so nothing dramatic (from my perspective). the muscle in the 757 is certainly impressive, and will be missed once they're all out of the fleet.