Very nice! I'm a big fan of the flattop .44s, always think I need one more. My two shooter flattop .44s have steel XR3-RED gripframes on them - however, I don't find the old XR3 frame uncomfortable to shoot, I just have big hands and need a little more grip area.
I like your grips. Despite Patton's comment from years ago, I think pearl grips can be quite attractive. They look good on your .44.