Company bought me the truck and gave me the option of a tonneau cover. I'm not a fan of the 3-way flip style or the rollback style. Personally I prefer a one piece solid cover. While I was hoping for something that similar to what I had on my '98 GMC Sierra (Snugtop) I ended up with the A.R.E. LSII cover http://www.4are.com/product/lsii/
The quality and the construction of this cover blows the SnugTop out of the water. The only thing I'm still adjusting to is the raised points on the top. Technically they match the hood lines, but I'm just more used to a lower profile flat cover. I am not sure around the country, but here in Texas for every 10 tonneaus I see easily 7 are A.R.E.
Here are some pics (Crewcab Standard Box)
(FWIW, Yes, I took off those bars/steps! haven't updated photo. God they were ugly. Company requires vehicle to come with them from our Upfitter, if we keep them on is up to us):