Ok...here are the results (posted in the cooking section as well). Since this is the first time I cook ribs on a Weber kettle, i can only give what i experienced without caparison. I used a weber basket with the G'rillaQue banked against it. I was hoping with the coals pack in close together I would get a good burn. I filled the basket with 30 Kingford's briquettes (left one side of the basket open for the lit ones) and lit about 10-15 in a chimney. I then placed the lit briquettes in the basket filled the GQ with hot tap water. I place apple wood chunks on top of the basket for smoke.
With the my bottom vent 50% open and the top 100%, The grate temp (using Maverick 732) continued to slowly creep up by 2 degrees. I put the ribs on around the 230 mark and monitored the temp as it continued to climb. When it hit 260 and noticed it wasn't stopping, I closed the bottom vent to 12.5%. The temp started to drop and leveled at a perfect 250. It stayed like that for 2.5 more hours fluctuating 2-4 deg. at most. Needless to say I was very please with that which included open the lid to spritz every 20-30 min. After putting the lid back on the temp recovered very well and maintained at 250.
After I wrapped (in foil with honey butter, brown sugar, and apple juice) i noticed my temp had dropped to 225 - 230, so i decided to add about 8-10 more briquettes on top of the lit ones and it did not take long for the temp to recover to 250 (about 15-20 min). I left them wrapped in foil for 1.5 hours, then unwrapped and applied some Sweet Baby Ray's bbq sauce and finished off about 30 minutes uncovered.
As you see below, I think they turned out pretty good. I could have left them on for a bit longer but it was a good bite with no tug. Definitely not fall off the bone but still edible. My family was getting impatient.
All in all i am very please with the performance of the GQ. I still had plenty of water left so it would seem that longer cooks would not be a problem. It provides excellent direct/indirect zone in my opinion and will continue to use it for future cooks. Also, I will definitely figure a way to use more briquettes, either by modifying the basket to hold more or make a larger one out of expanded metal. This will help with longer cooks and will prevent from having to add while cooking.