I had one for a while. They take a little getting used to, but it's not that bad. I eventually went back to a 75% for a couple reasons:

1. They aren't a true split keyboard, which means that the distance between the sides and the angles are all fixed. Maybe that just happens to coincide with the right position for you, but it wasn't enough for me, so it wasn't any more ergonomic than a normal keyboard.
2. They are very large for the number of keys they have.
3. Certain keyboard shortcuts, or just specific keybinds in games, are annoying to execute on account of the split.
4. It's harder, or at least usually more expensive, to find keycaps. You'll also need more stabs, which is more expensive and more annoying to lube.

So they're not bad and if you just like them, that's fine. But aside from preference, there's not really anything better about them.