Picked up my new stick for the DW season this week. Last year I spent some time on the ACE UL 18'x26.75" - which was a great board, super fast - acted like an ACE 14' on steroids!
The 2018 ACE UL 18'x24.25" comes with steering standard this year. It's a simple design with the batten set into the rudder post to centre it, rather than the tiller arm. Really clever.
I took it for a flatwater paddle yesterday and was pleasantly surprised by the stability - it was easily more stable than a 25" wide ACE 14', on a par with a 27" wide ACE and only slightly less stable than the 26.75" UL. (On flatwater though).
The shape is sleek, parallel rails - without the forward width of the 26.75", which should fare well chasing down runners - which is the advantage of the ACE shape over the flat deck shape IMO.
Can't wait to get out on the ocean!

The 2017 UL 18'x26.75 for reference
disclosure - I am a Starboard Team rider. I pay for my boards and believe in the product.