I have a M28 (N frame 357), and I love it. I was looking for a 686, but this came along and I could not pass it up.
I have to tkae a different opinion to Fonix on the new versus used; I would say buy a used one. Unless soembody has been shooting a pile of heavy loads through it, a 686 should be in good shape. To add to the top of this, S&W has been putting the internal lock on their new guns which are having mixed reviews; I personally have not used one with the lock so this is all second hand info. Also, a couple hundred dollars can buy an awfull lot of practice ammo; if you keep your eyes open you can sometimes snap them up for a greater savings than that.