Up: 80% of my commute from home has a bike lane
Down: The road from my subdivision sucks big time

Up: My route is fairly straightforward
Down: There isn't a good way to add on an extra 5-10 miles without going completely out of my way. At most I can do a mile or two.

Up: I get to ride a bike!
Down: I have to wait 8 hours to get back on it