Does Anyone Use Brainbench or prove-it.com online testing sites if not what do you use

Now I generally have a bench/engaged architect conduct a technical interview with candidates that are going to my direct relationships such as managers or team leads but it simply isnt feasible with time constraints and volume capacity requirements in VM accounts where we are supporting 100+ open orders a week to get these guys on a tech testing site nor is is cost effective.  I generally reserve this again for my direct clients where I have a direct line to the decision makers but I am curious what tech testing sites are being used by you fine people today as I am conducting research on how to increase submittal to interview to hire ratio in VM accounts that is both cost effective and quick!