I just had two root canals done by Dr. Sim and am very happy with the service I received. I came across Dr. Sim by chance, since he was one of several endodontists recommended by my regular dentist and I chose him over the others simply because he happened to have a short term cancellation where he could fit me in.
This worked out very well for me, though :-)
Dr. Sim turned out to be very friendly and professional at the same time; taking time to talk and listen (!!) to me upfront while discussing my treatment plans and options.
The actual procedure (incl. x-rays and anesthetic) took about 2 hours and was to my big surprise pretty much pain free (!!). Although keeping your mouth open for such a long time is obviously not the most comfortable posture, but that is just due to the nature of the procedure.
The overall facilities are good and the front desk staff is friendly. They checked coverage upfront with my insurance and gave me a clear breakdown of total cost and insurance coverage before commencing the procedure.
A clear thumbs up from me.