I bought my best guitar from them.
Mike sent me pictures of the guitar I was interested in and other ones (just like it) before I actually purchased it.
Their customer service is beyond great.
They're super legit.
They're solid. Like any music store they'll insult you with what they'll give you for a trade, but that's business I guess. I've bought 3 guitars from them over the years the first being a used Gibson Heritage acoustic back in 1982 at their old location. I currently have my '82 Gibson 335 there for a refret so I guess you can say I think they're to be trusted doing business with.
When I was on the road I used to love to stop in to the Chicago Music Store...with the harp guitar hanging over the front door. Last time I went there they had crime scene tape in parts of the store. My kinda joint.
Also a local.. Rainbow is excellent. Bought my 71 Les Paul from just yester..er..wait 1974 i think..when it was the little shop around the corner on Grant Rd..
Bought and traded a lot with Harvey back in the days..