I used to use the Lihof 679cc and was always impressed with the logical ease of use and the sturdy way it is built. To me, it is the only rock solid and 39+ megapixelback worthy TC on the market. However i have put mine up for sale as i switched to the Hartbleicam HB1. So if interested, i have a great 679cc complete set for Hasselblad-V and it is almost for free ;-))