Thats a rather broad question. Are you asking how they are in comparison to other areas? I'll imagine that residents will say they are too high, doubt you'll find many that will agree they are "just right", but will find those moving from New Jersey that might find them a bargain.
You're probably talking about Lower Merion, but Bryn Mawr is also part of Radnor and Haverford - they are all different school districts with different taxes. If you have a specific property you're curious about, it's all public information - you can check with the township or with a local Realtor.
111 N. Wayne Ave.
Wayne, PA 19087