I guess the most important metric is what is the absolute value of the battery drain and is that level acceptable?

That's a good way of putting it.

Last week I noticed that my phone needed to be charged before the end of the day. I was using Summit roughly the same amount as I used Sync before that. When I was using Sync, I didn't need to charge my phone before the end of the day. That's what prompted me to look at the battery usage chart.