I really like the flexibility of being able to pre-cache areas that I know I'll be in a lot to reduce data use while driving, but I also find myself navigating with the satellite layer enabled from time to time, which does use quite a bit of data, and which you can't really pre-cache since the data volume is quite large (and varies depending on what zoom level you're at.) I think Maps hits the sweet spot here -- if you want more detail, you can get it, but the vector-based road map layer is enough to do just about everything. Wouldn't be bad to add the ability to select cached areas state-by-state or county-by-county instead of just using rectangles, but that's really a minor quibble.