It has been a couple of months since I have made any comments in this thread so I thought I would update it a bit.
The Duo2 has been used as my main receiver since December 2013. It replaced my Optibox Raptor which is still in use at another location.
Tuners A,C, & D are currently in use. Tuner B will probably be used later this year when another dish is added. Here is a list of how these three tuners are normally set:
Tuner A = 1.8 meter dish, motorized with a VBox positioner.
Tuner C = 2.2 meter dish, motorized with a GBox positioner
Tuner D = 1,2 meter dish, motorized with a DG380 motor.
Tuners A&D are ku band. Tuner C is C band.
To date, blind scan only works on tuners A&C. This needs to be fixed where blindscan works equal for all tuners.
The Duo2 blindscan is decent but it can be painfully slow on some satellites.
Tuner E, ATSC does not work. I am still hopeful with this one, but no progress in this area has been made for months.
OpenVix Images seem to work the best for North America. The current OpenVix build is 3.0.808, from December 2013.
The Duo2 Picture Quality is the best of any fta receiver that I have tested to date.
The Duo2 is also King of Record. This receiver can record an entire mux at one time. It can also record while scanning. I have yet to find the true recording limits of this receiver.
The hardware seems to be good. I have left the Duo2 running for days on end and have yet to have any type of hardware failure.
Here are some things that I hope are fixed soon:
Blindscan for ALL installed tuners. (The Duo2 supports additional DVB-S2 usb tuners).
The ability to play AAC radio channels.
The ability to record radio channels.
Overall I am extremely pleased with the Duo2. The only thing I might change if I were to buy it again today would be the tuners. VU+ has been slow to fully support the double tuners, so I might purchase just two tuners instead of four. IMO, extra tuners should not have been offered if they are not fully supported. EB