Purchased an Enve Melee after a high speed crash destroyed my S-Works Tarmac. Sz 52, 40cm bars, 100mm stem, built up with SRAM Red AXS with a Quarq power meter. Rolling on Carolina 50mm wheels, Industry 9 hubs and GP 5000 TL 28mm tires. I currently have approximately 400 miles on it both trainer and outside. If I compare it to my Tarmac the geometry is almost exactly the same, matter of fact, the only difference is a 4mm longer top tube and about 150gms heavier.
This thing is stiff...but in the right places. I think that is mostly a function of my going from QR skewers to thru axles. Fully built it's about 1.5lbs heavier than my Tarmac but I went from rim brake 11 speed to disc brake 12 speed and I think that is the main reason. It doesn't feel like it has the same snappiness as my Tarmac did when climbing but all out sprinting and cornering at speed I don't notice a difference.
My only complaint if I had one is that it is only available in one color. I typically build my own bikes because I don't want anyone to have the same bike I do and with only a single paint color that significantly increases the odds I will see another that is at least similar.
Long story short, I don't have any regrets and I am happy with my purchase, would definitely buy it again and recommend the Melee to the serious cyclist!!
The enve post head makes this post kinda cumbersome but it seems to flex in the right spots and though it's D shaped it is at least strait so as long as your saddles rails are strait you are good to go.