For those of you with a 2H/1J setup, is the Joey able to see and playback recorded content from both Hoppers?
Yes. You can select which Hopper the Joey looks at and change that at any time.
Also, do both Hoppers need their own internet connectivity or can only 1 of the 2 Hoppers connect to the internet and it will automatically provide connectivity to the other Hopper and the Joey?
One and only one Ethernet connection to a Hopper and you'll have that connection available to all units. That's the theory. In reality, it seems your best and most stable bet is to have them install a HIC and that too will provide Internet to all boxes.
My install is coming up in a week (as we're on vacation right now) so any advice on the install or things I should be aware of that are unique to a 2H/1J setup?
Oh, and one more thing. I'm having a sling adapter installed. Does it matter which Hopper I connect it to? Will the Sling see and be able to playback content from both Hoppers?
Thanks everyone for the input.