The gun on the left is a 620 with Jerry Miculek grips (made by Hogue) The gun in the middle is a 520 with Altamont grips. Both are round but L frames and can take either grip. About a 1000 rounds and some Wolf springs and you'll like that 620 a lot more.
Dale53- Nice 520. I should have bought...
My wife just adopted one of mine, a Browning Hi-Power that she shoots really well. I in turn bought her a new Beretta 20ga shotgun that had such beautiful wood I couldn't cut the stock to fit her so I just kept it for myself. I hope she understands.
You should be able to still get them from Smith. I bought my 586 with rubber grips and called Smith&Wesson with my serial # and they sent the wood grips out to me. If not, call Altamont (spelling?) they make them.