I'd say 85% of my, work work, is with this guy and even at $300 it can make that back, if not more, to you in one assignment. Definitely leaving you wanting more, but only if you frequent areas it lacks in like low light or a wider angle. Also seems a tad skittish with its weather proofing given an external zoom, but I haven't looked whether it has internal seals of sort or not (from all the play in its covers, I'd say it doesn't).
For night time flash work, it beats 24-70 with weight alone and shooting around 4-5.6 the sharpness becomes honestly marginal to my eye.