I'm currently riding a Rans Rocket and commuting 20 miles daily for work, plus extra for enjoyment and errands. Sometimes I pass, more often I'm passed.
I rode my Klein wedgie one day last week and I think I was a slight bit faster, but wow did I notice the increased tension in my neck and shoulder blades! I also realized that I didn't notice what was going on around me as much - wildlife, sunrise, etc. Recumbents have way more benefits than just speed.
Doug