Tamron 16-300: Any first-hand impressions?

Update from poster: Fondled one in the flesh at a local camera store. Size and appearance first-rate. Balances well on my 70D. Zoom action a bit stiff (there's a lot going on in there). Impressive range, especially at 24mm equivalent. However, not at all impressed by the noticeable pincushion distortion at mid-range and higher focal lengths.
 
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