Coincidentally I heard the Vandy 1Cis at AudioConnection this summer with Quicksilver tube amps playing Doug McLeod as well. I was there to buy Treo Cts. I did purchase them and they are fantastic! The thing is, the most impressive, surprising event of the day was the Model 1s. John played them at volume and they had a clarity and especially presence to them that I could not stop thinking about well after the experience. I agree with cedargrover about their synergy with a good tube amp. It was over 20 years since I had heard a Model 1. The current production is a whole different animal. As is always the case, Richard Vandersteen keeps learning from his other designs and then trickles improvements down to his other offerings.
Good luck with your decision!
Good luck with your decision!