I've used the commuter clause a number of times and never had a problem. Some things to remember
- Call sked to let them know that you may be using the commuter clause (after your plan 'a' flight goes bad).
- keep you seat requests. I've never been asked for them, but this gives some peace of mind.
- the company knows that you want to get there, because if you don't get there, you don't get paid.
- be nice to sked. They are in the same boat we are, understaffed and stretched thin.
-