Just had my base timing advanced 2 degrees

Just thought I'd report, though I really don't have a lot of info to offer. I was going to try to do before and after G-tech runs, only to find the road outside my neighborhood that I use for the purpose torn up for utility work. Conditions were about the worst imaginable: 100 degrees, super high humidity w/ heat index >110, very windy. Anyway, the procedure is quick and painless and you shouldn't get charged over $50 for it.

As for differences, I had to rely on the ol' butt dyno and haven't driven it a whole lot yet. Something DOES feel different, but it's hard to describe; it is subtle. There does seem to be a bit more in the low-mid rpm range and I haven't driven it hard yet. Only took it to redline once.

I have to admit, I don't know much about the concept behind this adjustment. Can someone explain how it works and what it's supposed to do? If I can feel something down low, it shouldn't take away anything in the top end, right?