Those extendable arms would make things much easier. I got them on a smaller tractor and I love them but it just doesn't have the hp to pull my mower.
As for making 90 degree turns it does alright. I actually leave less divets (smiley's) in the field with the caddy than I did without it but that is just me. I usually x the field when I'm done anyway. I don't back up cause mine's a conditioner mower and this can cause some problems.
Though I love my caddy and would hate to cut hay without it, it is just one more link that can break.