One nice thing about going back to a novel you wrote over ten years ago is the discovery that you've become a better writer.
I can see my misuse of semi-colons, for a start. And I am able to find tighter, more powerful ways to phrase particular sentences. I'm aiming to cut, particularly since the pricing of the books will be impacted by page number, and so it is a fortunate thing indeed that I seem to have become a more concise writer.
It's also nice to find that I wasn't that bad back then, that the story moves along less cluggily than I thought, that what I considered an info-dump in the second chapter is at least an interesting bit of information told in a way which entertained me.
It's good to meet these characters again, and like them.
Although going the publishing submission rounds for so many years was a draining and negative experience, it definitely benefited my writing to wait and grow.
Added to this is the excitement of receiving the first "thumbs" of one of my commissioned covers. It is amazing to have a scene which I've been picturing mentally for months now coming to life (with considerably more detail and compositional balance).