Don't regret buying it because of the experiences with it I had just started riding again for about 2 years after a 30 year hiatus. I was riding my 1971 Motobecane Le Champion to work when I encountered a car at 21 mph. It turned in front of me and I only had time to say "Sh...." The bike was too bent up to fix and I was looking for a replacement with the insurance money while my left Humerous was dangling to my side. I decided one day to do a stupid search for Colnago on CL in the Portland OR area where I lived. There it was! I had to drive to Hood River to pick it up. What a location to find a Colnago! I knew it was a bit small but we negotiated a price and I brought it home. It was my really first dive into C&V even with the Le Champ. Learned a lot with it and had a number of good rides during tough times of unemployment. So it has a lot of memories associated with it.
Because it had a couple of parts that weren't right, Le Monde post, the search was on to replace the 4 components needed. Drillium Dude provided the seat post and pedals while he was in Drago Garcia and the other parts were acquired on CL to make it as Campy as possible.

As you may have noticed, there isn't much difference in the height of the exposed post or stem between the Colnago and the Pinarello, but it just enough to make a difference. What is interesting to me is the 2010 Langster in 21 that would be considered too tall but rides really well and meets the "fist full" of post length. I consider it to be the max size for me. There is the fit range, Colnago at 58 and Langster at 61. I've been on smaller and it is not comfortable.
2010 Langster Steel 61cm, on Flickr