My experiences with commercial agents has been relegated to the broker that we have been using for over a 10 year period.

I agree though, a redfin type service will also evolve and take shape for commercial properties. However, from the commercial side of things, a lot more due diligence needs to be done (depending on the property type) as opposed to buying a home. And often times many 'good' commercial properties never make it to a listing service like loopnet etc.