I picked up a basically NIB 37 for a decent price a couple of years ago. Was actually out shooting it yesterday, as I hadn't shot it in a while.
Our State Police used to carry them and used to practice at our club's ranges. They left a ton of brass lay, and I used to pick some of it up, figuring at some point Id probably pick one up. That worked out.
I had a 21SF in the past and it was just to big for my hands. Had a 30SF too, which was a little better but still a bit big. Both were shootable and shot well, but my 9mm guns were just a lot more comfortable in my hands. The 37 is too, but there is a noticeable difference between it and the 9mm guns, as the slides are heavier and fatter, and noticeably different. Compared to a 9mm slide, it looks like one that had been stung by a bee when you're looking down the slide.
While the grips are similar, the difference in slide dimensions will require a different holster than your 9mm guns.
The 37 shoots great and is accurate. Recoil and recovery are on par with the 45acp guns. I had to stipple the grip as I need that more aggressive texture, and more so with the heavier recoil, otherwise the gun would slip around in my hand as I shot.
I reload for it and its as easy as anything else to load for, but its not just a shorter 45acp. Youre basically limited in loadings and to 185 and 200 grain bullets. Of the three manuals I have, only the Speer has data for it.
I keep hearing that you can use your standard 45 dies, but that wasnt the case, at least with my Hornady dies. I ended up getting a cheap set of Lee "45 Glock" dies. Not as nice as the Hornady's, but they work and they were a lot cheaper. Kind of a PITA though.
If you can find one at a good price, and your are interested, go fo it. Why not?
If you reload, get a bunch of brass and you'll be better off if you want to shoot it a lot.