I had one, bought NOS as a frame in 1977. One had to adapt to it, flexible, but it rebounded so was not as flexible as the sway seemed. Short top tube for the seat tube size. 22" had a 21.5" TT, 23" had a 22" TT. 74° parallel for all, 26.8 seatpost, Dura Ace Headset & seat binder bolt standard, along with Shimano produced oversize top tube cable clips for the brake cable. English threading, 120mm spacing, no changing that, Everything clamped on, no braze ons at all. Waterbottle cage was a problem at the time as the down tube was oversize, some guys used hose clamps, some just put a cage on the seat tube. From an engineering view, the necked down tubes were bad for stiffness. the fork should have been straight, the bend for the rake put all the flex near the crown due to work hardening, wheelbase would shrink up to 3/4" during a moderate stop. Light for the day, 17lbs. with "normal" Campagnolo.

Sold mine in 1978 for a tidy profit. I would rank it above the Speedwell, barely. Stay away from the painted ones, they ran a "special" of aqua blue frames near the end, about $200. cheaper, rumored to be rewelded frames that cracked... They were vague about them being cosmetic blems prior to paint...