I compared the Model 5 to a set of Proac Response DT8. The amp I used was a Luxman integrated with a Luxman CD player.
Pros:
The KLH had really good bass. It was quick and accurate, much better than I expected. They image very well and project an excellent wide sound stage. They sounded a tad on the warm side on my system.
Cons:
They really seemed to lack dynamics but they are a smaller speaker. They also didn't have the resolution I am used to.
My Proacs don't have as good of an off axis response that the KLH and they are also fussier setting up. The Proacs bass is more robust and go much lower (28hz) but they are not quick but still very good. Sound staging is fairly equal between the two but the Proacs sound a little larger. Vocals on the Proac are much better, more realistic and lively. Dynamics are also much better on the Proacs as is resolution. These speakers are lively and fun in comparison. The Proacs are just superior by a fair margin.
I personally think there are better speakers in this price range. I really like Golden Ear Triton 3 plus's in this price range. This is a somewhat underrated brand by some but those speakers are shockingly good for the money. I don't think they are that attractive of a speaker, but they are one of the best values in speakers I have ever heard.
KLH 3600 cdn
Proac 5200 cdn
Goldenear 3800 cdn
just for reference