So I have the Bakflip MX4TS (has the T slot rails). I wasn’t pleased with the condition that it arrived in (aluminum chips, broken plastic corner cap). Once I cleaned it up and got the cap replaced, I’m perfectly happy with it. It’s slightly thinner than the GEN 3 which I view as a benefit as it gives you a tiny bit more room. I have to go with the triflip as I need the entire bed volume for what I haul on a regular basis. I’m not understanding the “piece of crap” comment above. It’s solid quality once you get past the initial “how it’s shipped” concerns.