I found everything in the review to be spot on, and would recommend this lens to anyone in a heart beat, even at the new price.
I did have a scare with mine though, just yesterday. A hawk landed in our back yard and I threw the lens on to take some pictures. It wouldn't focus! Of course I jumped to conclusions and thought the SDM had died on it. Instead, it turned out the battery in my K5 was nearly drained. Fresh battery and everything was right with the world - except the impatient hawk didn't stick around while I was changing the battery.
I have to update my response. Turns out my lens has failed and has been sent in for repairs. :-( So much for that.