That differential dual guiding sounds awesome, finally external guide without differential flexure effects. And a synthetic guide star!!, and back illuminated models. Altogether an amazing array of new features.
And that mount, huge. But look at this
http://www.optcorp.com/product.aspx?...278-10305&tb=3
Harmonic drives, no counterweights, wierd.
and this
http://www.astelco.com/products/ntm/ntm.htm direct drive, no gears, increadibly low PEC (no guiding needed?).
Theres some hot new gear out lately, we live in interesting times ;-).