Taking public transportation to work is like anything else in life ... it's all in the timing. If you miss your connection, you're messed, especially if you're riding buses in two different counties. SF Muni I understand; I've been riding it for years. SamTrans is a totally different story, moreover, it's a totally different county.

But there's something universal about taking a bus. In Bali, London, Honolulu, NYC, Chicago, LA, Washington DC, Virginia, Maryland, and the SF Bay area, the buses always run late.