Was there last night and had a good time.  I learned several things:  1.  Charlie's has a cover charge of $3 if you get there after a certain time, I believe this starts at midnight or 1 am.  I got there after 1 am and the place was packed, absolutely packed.  
2.  Yes, in Phoenix, some bars can stay open until 4 am (gasp!).  Yes, I know, it blew me away as well.  
3.  The little Mexican food place attached to Charlie's serves really good food late night, but now I understand why they can't sell water or soda through the inside window to Charlie's customers.  That's because Charlie's wants to charge patrons $2.50 for a bottle of water than the Mexican restaurant sells for $1 outside.  
Other than that, I had a good time.