I've only had the X2 on the Tundra for about a week, so far so good. The installation was pretty straightforward. It took me and a buddy about an hr to install the cover, along with the Bak2 utility box. This cover is not waterproof, but your stuff won't be soaked either. My only concern would be how the outer weather stripping along the top of the bed rails hold up. I believe Bak could use a little bit more of a rigid rubber to obtain a better seal. Overall, it's a great cover!
Extang 2.0 Review
Cover is Heavy Duty! One thing I will mention is the instructions are not real clear as to wether your truck is equipped with a rail system or without as far as which cover you will need? If you have a rail system you need the one for rail system. I ended up removing my rail system from truck to get my "With out rail System" to fit correctly. Once all this is figured out its a very SIMPLE install! P.S. Auto Anything is very easy to work with and a excellent resource for truck parts.
Undercover Ultra Flex Cover
Good value for the money. Quick install. Does leak around the back corners..Haven't had time to figure out how best to stop leaking. Figure a gasket across back will control leaking. Secures and functions as advertised. Great having versatility of flexible access to truck bed for hauling,etc. Previous Tundra sported a hard Undercover lid. Limited access was a challenge at times.