So I've had a few hundred miles on the bike now and initial reports are exactly what I was looking for and envisioning when going through the build process with Jeremy.
Changes in geometry and measurements from my previous frame were to slow the responsiveness/twitchy feel ever-so-slightly but still make for a quick handling bike. HA went to 72.5 and SA to 74, from 73 & 73. Fork Rake from 43 to 45 and TT length from 55 to 54cm. Stem from 110mm to 120mm. The wheelbase ended up being very close to the same with the chainstay length staying at 405mm.
My previous frame was very responsive to body input and hip movement, TWITCHY, especially on fast twisty descents. While this made for a fun bike, it also meant I had to fully pay attention to my descending. On the flip side, my Swift Ultravox Ti, feels a little more relaxed or lazy when descending. I wanted this frame to be closer to my previous Sycip, but a not so twitchy. This bike is just that! On the flats, it is quick to accelerate and responds to power almost immediately. I think the quickness can be attributed to the 23mm round chainstays and the huge 42mm shaped HSS downtube. Climbing is met with no noticeable flex or loss in power when putting power down seated or standing. It feels like it moves forward equal to each pedal stroke and power being put in; whereas my carbon Swift feels a bit dead or maybe sluggish, like I have to put more power down to increase my momentum or speed slightly even though the Swift is 2lbs lighter with the same wheels. Comfort has been a pleasant surprise. It has a feel that I can only attribute to what steel is known for and what I remember from an old carbon/steel Lemond Zurich I used to ride. It stays connected to the road, soaking up feedback and distributing those bumps through the whole bike, unlike my Specialized E5 aluminum bike. And I'm happy to report the Berk Saddle is more comfortable than you'd think a 73g all carbon saddle would be. Longest ride so far has been 2.5hrs and no problems. A friend I was riding with the other day wouldn't believe me...he ended up riding it for about a half hour and could not stop talking about how it was more comfortable than his Antares.