With Orby only using a single satellite makes installing the dish so much easier.
I've observed that setting up a DISH (or DIRECTV Phase III) three-slot dish isn't any more difficult than an Orby dish. All of the adjustments are accomplished in exactly the same way. The Slimline is perhaps the most persnickety (but it features the coolest adjustment facilities). Dishes that require skew (including the Orby dish) are designed to be preset so you don't have to worry about the "outer" slots (or the polarity with Orby). Perhaps the Orby dish is a little more forgiving on skew, but I preset it as carefully as I would a DISH or DIRECTV dish.
All dishes beg for a plumb mast and the Orby mast adjusts the same as everyone else's.
My lake system has the DISH 1000 (quite a bit smaller than the 1000.2) mounted on a chunk of plywood with three 2x2 legs (a really short tripod) and it usually takes me under 5 minutes to be watching TV (no outboard meter or undoing the cable required).
The DISH 1000.2 has about the same sail area as the Orby dish that is around 5-1/2" narrower than the Slimline.
I submit that there is no advantage to the Orby dish over a DISH 1000.2 with respect to setup. The Slimline's screw adjustments may compensate for much of the additional diligence required to dial in the Ka slots.