I've been shooting 627-5 V-comp going on 3 years at least at one sometimes 2 monthly matches. Easily my most favorite revolver, astoundingly accurate.
Can get by without the moon clips, but far easier to use them when time is critical. 38 cases load easier than the longer 357 as the cheap clips I have allow a bit of movement. Trying to stuff all 8 in the holes at the same time is an acquired skill!
Rarely see one for sale in my area, and not many being used in the small matches I attend. And the 627 is a different bird than the lighter 327TR8 with very different handling qualities. I shoot side by side sometimes with a buddy that has the 327 I almost bought....and I'm VERY happy I got the 627.
I haven't found any 'cons' to this model. Maybe the price, but the performance level is higher as well IMHO. I have one like the photo above, without the muzzle extension mounted. Haven't seen any need as of yet to mount it.