We used Celtic Movers & Storage of San Francisco to move half of a mostly pre-packed two bedroom flat. Other than our wall hangings, everything that wasn't prepacked (including our couch, our mattress and a desk) came out ripped, stained and broken.
It cost twice the price of the estimate, and we had to babysit the two regular movers and their friend for them to get a move on. After they were done, it took them 30 minutes to give us the bill, in which they included their 30 minute post completion break.
Lazy, slow, careless. Not what you look for in a moving company.