i think it depends alot on which part of TW you go to. i went with my 18-200 and found that it is not wide enough for scenic shots at taroko. 18-200 is useful for taipei walkaround. I'm going again in Feb this year still considering whether i shld get a uwa for taroko and alishan or just stitch them together to save cost and trouble of carrying extra lens. Danger is that if stitching fails then thats it, no more going back.