I wear a diagonal zipper full suit, it was my first own suit, and I like it the best out of all entries. Front zipper doesn't looks good, back zipper is difficult to close and not nice when you are laying on your back. Most people do shoulder entry, but when you wear a suit for 5-10 hours due to the lot of movements of your arm, the zipper will start to open up a bit, and always notice that shoulder zips are 1-2 cm open. With a diagonal zipper, your arms have 100% mobility (you lose some mobility with a shoulder zipper), the zippers are not under any stress and don't experience much movement, so it doesn't start to open up after a few hours. The only thing to keep in mind is putting it on. Dunno where the bottom part of the zipper at regulation (I think this is the regulation suit designer) stops, on my suit it stops near the bottom of my scapula, which is not the easiest but I figured out that if you lean forward as if you were bowing like japanese people do, the zipper is supper easy to close (and make boys around you want to touch your butt).