Has Gdocs had better reliability than the average desktop PC, with MS word? Has Gdoc's made businesses more productive due to co-working on documents together,

Has Gdocs had better reliability than the average desktop PC, with MS word? Has Gdoc's made businesses more productive due to co-working on documents together, rather than emailing around word documents? lock-in? Why do you feel Gdoc's provides lock-in? How is it a walled garden?