I have one...
It's a good mic, I guess I'm an early adopter, and bought it based on the great press the KSM32 was getting. My goal was to have a single mic, and I wanted the multiple patterns found it as opposed to the 32.
It does exactly what I bought it for, its a good condensor mic, but I can;t say I've been blown away. The press on the 44 so far has been a bit lukewarm, I have seen reviews in SOS, prorec, mix, pro audio review, and Electronic Musician or Recording (can't remember) which. Well, actually, SOS and Mix were lukewarm, prorec and the mystery article liked it.
I haven't had occasion to use the patterns yet, so I can't comment on those.
If I had it to do again, I probably would have picked up a TLM for acouple hundred more. There have also been some strong words regarding a new mic from JoeMeek (studio projects or something or another) that Pete Leoni swears sounds exactly like a u87.
For mics in it price range, I would offer that it doesn't make much difference. The AT's (4047, 4050) are comparable, and all are superior to the typical 200-300 mics out there.
Based on my experience, I would say that its a good mic, but I'm not sure its worth the $699 I paid for it.
One thing that has made big difference in its application has been the addition of a DBX
silver series front end. I'm getting a much bigger sound out of the ksm with this than I was getting with my Aark Direct Pro.
So maybe the lesson is get a good mic, but make sure the rest of the chain is taken care of. One of those studio projects mics could be had with a voice channel for the price of the ksm.