Good burger! We were in Madison and heard DLUX was casual and good so we gave it a shot. It was Sunday and the packers were playing later in the day, plus Sundays are unlimited mimosa day, so it was full but not overly crowded. The wait for a table was 45 minutes but luckily 3 seats were open at the bar for us so we took that option.
Service was attentive and not overbearing. Burger was pretty great, as were the fries. Good selection of draft brews, many local.