I talked to the progressive tech today. He said the ultra low is for looks rather than performance and I will be disappointed. I think I will try to find some used 944s. Some like them and others dont. Those that do not care for the 944s swear by shocks built by howard.
I installed the 944's on my 14 Ultra, I love them. I did a 600 mile ride to Northern Maine last weekend where the roads are pretty bad, I have no regrets and I would recommend them. By the way after adjusting the sag, it ended up being 1" lower than the stock Air Shocks.