You never know when you enter the shop that you're going to meet a famous violinist, who often will simply stop and demonstrate for young visitors. I have heard of many young people become inspired to be a better musician just by walking in the door.
Don't expect crisp glass shelves or a fancy lobby--expect what you would expect from a good violin--tradition, history, seasoned experience and character.
Pros: Huge inventory, low prices, long history
Cons: can't think of anything