I do live sound and am looking to add a small diaphragm condenser to my mic collection. I'm tempted to forgo getting the Shure SM 81 and try out the 37r. Anyone ever used one for live sound? HiHat, hippie percussion. acoustic guitar? How durable are they?

Bob Weston likes them a lot.... he talks about them often in this forum. Here is a thread about recording the Burn to Shine - Chicago edition and he used them in a few applications. (scroll down to his post)

If you use the search function in this forum you will see lots of people talking about the good qualities of the Pro37.

A live sound company I worked for has a couple of them. I've used them for drum overheads, hihats, hand percussion, choirs, sections of a big band, a piano, all kinds of things.
They are really handy because of their size and look they are pretty unobstrusive. Which can be a bonus in a live sound situation. They are stored in a case together with other mics. No special care taken and they have survived a number of shows without any problems. The Pro37 is a very simple and sturdy little mic and I'd say they are durable. From the perspective of durability I can imagine that they are more solid than a Oktava MK012 - which is a fine and inexpensive mic as well - but on the Pro37 there is no thread for capsules that that can wear out or collect dirt. On the other hand my MK012s were hitten by drum sticks various times and are still fine. Pro37s can sound a bit hard in the upper mids (5kHz?) and don't have the same amount of top end as 4051s or 4041s have but I've never really missed it.
I have a pair as well and like them - not just for the money.
Here is another link to prove that I don't work for Audio Technica.

I've read all the reviews of the sound quality of the mic on this board and others. I was mostly curious about the durability of the mic. Thanks for answering my questions.