I think you will be pleased. Of course mine is not the ultra flex, so I can't speak specifically to that model, but this is my 2nd Undercover product...had a 1 piece hard cover on my Tacoma for about 10 years and it was very reliable.
Install took the shop about an hour...about as long as it took me to go get breakfast. I actually got to see both the Armorflex and BakFlip in person and how they operate at the store where I purchased. I think either of those would have been a good decision, but there were a couple of factors that convinced me to get the Undercover.
Have not installed any bed lighting yet, but I definitely want to! Too many "want to's" at this point!!