I was a long time espresso user as well. I started with css edit then moved to espresso when it was released. Now I just use Atom and codekit. One issue I had with espresso was that the X-ray feature used a WebKit (safari) browser and I needed to inspect on both safari and chrome. Now I simply use chrome and it’s inspector. There are some plugins for atom that will let you update your css from the chrome inspector and vise versa.