Any track frame is going to be twitchy and unstable at alpine descent type speeds. In fact any decent custom crit or time trial frame will be too. Many pelotons cruise at 30 MPH, and those speeds are easy to hit on a track too. When talking about alpine descents though, the speeds being referred to are 50 MPH+. I love my track frame and my crit frame, but they can be a handful on a two mile steep grade twisty descent. While in the city your speed range will generally be 0-30 MPH, in the mountains during a road race the speed range can easily be 0-50 MPH. This requires very different geometry. Thats why a lot of crit racers don't like TDF replica frames. That slack geometry is all wrong for a crit, but all right for long descents down mountains and long days in the saddle. In the City, my speed is predominantly in the 0-20 MPH range, and I need very sharp handling to navigate my way through traffic. Insomuch, traditional track geometry works very well for me. I'd be curious to see this frames geometry, as judging from my eye it looks about right for me. I especially like the shortened top tube. Great for my preferred heads up riding style, yet as mentioned in the ad it is all wrong for road racing.