im one of the younger guys here and yes, i do own a bike with a slanted top tube. i dont favor the look and it doesnt save weight. the seat tube still measures 60cm.

it does have one handy feature though... the slanted top tube keeps the rear of the bike higher when i hang it on my rack. this allows the rear wheel to miss the saddle of the bike below it. if i hang my tommasini in the same position the rear wheel hits the bike below.

if life were perfect the top tube would be level and my bike rack would be 6in higher.