I too am interested in the Sauer Chain Mortiser professional version (KST-L). Has anyone used this tool?

Timbertools.com sells them for about $2,400. I talked to the sales guy today and it appears to be a good product. Sauer is a German company that has been in businees for 120 years. It works similar to the Mafell mortiser in that it cuts across the grain so no chiselling is need on the mortise ends. I was told the only major difference between the Sauer and the Mafell is the rotation of the chain. Replacement chains cost about $330. Any comments or suggestions would be greatly appreciated.