I have a Diamondback SE on a short bed with MFT. It may not be for everyone, but I think it is great!
Nearly perfect waterproofing, works with the MFT in all directions, very well built, easy install.
Limited options if you want to retain the MFT corner brackets. And I can’t use a cover that has any part hang off the bed rails into the box, this one sits on top, so perfect for me.
Had a Fold-a-Cover on the last pickup, that one was very good, opened up more, sat on top, less sturdy, but not compatible with MFT. Although their customer service was great in 2015, not so much in 2019...
I’d recommend both.