This is not the same one Alan and others have bought in the past. As Matt rightly deduced this is the bigger brother. With 25lb carying capacity and ability to balance with another 8lb load ont he counter shaft side. One of the American vendors on CN forums indicated that the capcity could be increased by 50% with some accessories. Also the website mentions metal worm/gears. Look under the Features/Specs tab.
Here is a pic with two side scopes on.
http://www.ioptron.com/Files/Image/dualsetup.jpg
I think the only con that was picked up at the Neaf was that the shaft could not be moved side to side to balance, more load on the 8lb side.
Regards
Fahim