Let me break down the Clubhouse really simple for you.
Parking is a bitch, there is a huge office parking lot to the west (across the street) that I've never had a problem parking in.
The staff is all business, don't bring some shady looking ID (vertical AZ ID, cracked, peeling, etc) and expect to get your wristband.
If you need to use the bathroom and can get next door to The Horse and The Hound, do it. Their bathrooms are approximately 350% cleaner than The Clubhouse's.
The A/C isn't the best, so if you go to a show in the summer expect to sweat your respective nether regions off. Be ready to put your hair up, leave your pants (wear shorts) at home and hoodies in the car.
That being said, they have great bands come through. The bar is pretty decent and keeping the above caveats in mind will net you a solid experience.