We used Lockitron at the Cloudkick office. Super convenient, as it let anyone at the office buzz a guest/delivery through our outer door without leaving their desk. Also awesome: the ability to give visitors temporary access without having to keep track of making keys, ensuring they're returned, blah blah blah. Lockitron eliminated the dumb, day-to-day-headache-type-stuff involved in getting people in and out of our space.
