GPS/XM Weather Question

For those of you who have XM weather integrated with your GPS.

Do you use the weather information to paint a big picture of what's going on
around you. I.E. "If I fly 50 miles thataway, it looks like I'll be able to
circumvent this line of storms."

Or, do you us it on a more detailed level. E.G. "There is a two mile
corridor between these two cells, I'm gonna buzz right between 'em."

Realistically, since there is a delay between when the radar picture was
taken and when you got the information, how close are you comfortable
cutting things when relying on XM weather?