i'm setting up a htpc for a friend with a new hvr1600 and i must say i like it! 
dual tuners, yes, both usable at same time, very nice picture quality...
QAM support with beta drivers, which seem pretty stable..haven't played with the qam stuff much yet tho...
and while playing with decoders, i setup the intervideo codec with vmr9 and checked the "show cc's" in config and yes! it shows closed captions!
even on recordings...so finally a decent closed caption option...
so sub, if you need any test recordings let me know..
and is there a key to turn them off temporarily?
will let you know how it comes out with HD and QAM cc's when i get some recorded..yep, works with hd streams recorded to mpg...
edit: HD cc's are kinda jumbled, like the spaces are black squares instead of clear..so would be nice to have option to turn cc display on and off from remote..SD cc's are perfect..
also, the new driver cd has a new irremote.ini that lets you use MCE remotes and also controls MCE as well...
now i can use that gbpvr plugin for MCE...[launches GBPVR from MCE,and back when gb closed]

dual tuners, yes, both usable at same time, very nice picture quality...
QAM support with beta drivers, which seem pretty stable..haven't played with the qam stuff much yet tho...
and while playing with decoders, i setup the intervideo codec with vmr9 and checked the "show cc's" in config and yes! it shows closed captions!

even on recordings...so finally a decent closed caption option...
so sub, if you need any test recordings let me know..
and is there a key to turn them off temporarily?
will let you know how it comes out with HD and QAM cc's when i get some recorded..yep, works with hd streams recorded to mpg...
edit: HD cc's are kinda jumbled, like the spaces are black squares instead of clear..so would be nice to have option to turn cc display on and off from remote..SD cc's are perfect..
also, the new driver cd has a new irremote.ini that lets you use MCE remotes and also controls MCE as well...

now i can use that gbpvr plugin for MCE...[launches GBPVR from MCE,and back when gb closed]
Hardware: HDHR Prime, HDPVR 1212, Raspberry pi2, VFD display w/LCDSmartie