I have a smooth hound built from frame and various spares. It went through several iterations.
I also built a hammer head and found the suspension cut the vibration in the wrist but is a little soft out of the saddle; same as my old jetstream or my smooth hound with a redshift stem with soft setup.

i rode it in busy French town and it was great fun in busy traffic. it is great in UK countryside. But on easyclub ride with 700c bikes, it is like 2CX races on a trot… the small wheels may accelerate quickly but they don t have inertia so you have to constantly push.