In addition, they apparently put a little extra foam in at the tip of the armrest to get rid of some of the bagginess there.
And they did something to make the cording lie straighter along the upper drivers side.
Finally, I put some leather conditioner on it per their suggestion, and it did help bring the color and appearance a closer to the factory original.
Overall quite a bit better than before. Still not perfect, but you've probably figured out if you've read this far that I'm a bit of a perfectionist.
I'm pleased that GAHH stood behind their work and did the alterations at no charge, and would recommend them based on that.
If you're considering recovering your armrest, I would suggest that you ask GAHH if you can just send the whole armrest and have them do it. Might be a little extra charge but worth it.
Anyway, here's the final result... and hopefully with a little time it will blend in even better.