So yeap wangs are more expensive then jetpacks and helipacks yet offer less use.
For starters their gliding speed from what I've tested is slower than a player using a jetpack even in diagonal ascent. So perhaps make the gliding quicker. And then once again coming back to their cost and their name, being more expensive then both heli and jetpacks they should be a direct upgrade. I suggest that wings allow for ascent as well without having to exploit a bug. Yeap that's pretty much it. They do look pretty though