Pacific are a huge Taiwanese sub-contract outfit. They make all the Birdy and Airnimal bikes, but also design and sell their own bikes.What a machine! I never heard of them. How is the ride?
https://www.pacific-cycles.com/
I set the bike up with the same saddle and bar position as my 'normal' bike, so fit is great.
The only noticeable difference is the lack of gyroscopic input from the wheels compared to 700c ones. It definitely needs to be steered in and out of corners, but I quickly got used to it.
The suspension is only short elastomers, but it definitely takes the edge off the buzz from rougher roads.
The theoretical movement of the BB relative to the saddle from the URT rear end is not noticeable.
Also, braking can be a little sketchy (especially with my carbon rims), as the brakes have less leverage, given the small wheel size. It was OK when I lived in Cambridgeshire, but now in the fringes of the Peak District, the hills are a different level. It's gone through at least 3 versions, but the current one now has discs, so presumably that's less of a problem.
All the best,