If you pay for multiroom viewing you can watch content on any DVR in the house as long as your Slingbox is hooked to a single Directv receiver which can access DVR content. I have 4 boxes in my house. 2 are DVR units, two are H24 units that don't have their own hard drives. The H24 units can still access DVR content though, so I hooked the slingbox to the unit that my wife uses the least.

Not exactly. I have a Slingbox Pro HD, which I've had for several years, so I don't know if the inputs have changed. The Slingbox is an analog-input device. My Pro HD has component inputs for HD, and an S-video and composite input for non-HD material. You can plug in up to three video devices, one HD and two standard definition, and switch between them, which would allow plugging in two DirecTV DVRs. However, presumably, your DVRs are in different rooms, which means you'll have to find a way to get the analog signal from each to the Slingbox.

Why would you want to connect multiple DVRs?

All the SlingPlayer descriptions (Android, IOS, Kindle Fire) note that it only works with the SlingBox SOLO and the Slingbox PRO-HD. But it's definitely worth a shot to contact Amazon customer service to see if you can get a credit.

They did. I was "issued a refund in the amount of $16.41 as a one-time exception". I don't think it's worth upgrading to the new SOLO. I'll just read books on my Fire.

On occasion refurbished SOLOs pop up on sites like woot or dealnews in the $90-$100 range but, speaking as a fairly satisfied SOLO owner, I have to admit that the availability of Netflix and Hulu on pretty much any portable device these days makes the whole Slingmedia universe much less attractive than it once was.

Apple does refunds all the time, I would imagine the others will too. Even though the SPlayer for iphone says SOLO or ProHD only, it still works with the Pro version of the slingboxes.

In the email from Slingbox introducing the all new slingboxes, in small print:

"In honor of the launch all SlingPlayer apps are $14.99."

It doesn't say how long it will last.

Speaking of the new Slingboxes:

Sling Media officially unveils the Slingbox 350 and 500

Slingbox upgrade program

Anyone have one yet? (A 350 or 500)

I need to replace my A/V (thank you sling for your planned obsolescence due to the Android tablet app not supporting).

I'm looking at the 350 to replace it. I considered the ProHD but there are known quality issues with those, and I also can't help but think Sling will abandon support for them too. The Monsoon Vulkano products look interesting, read some great things about them, but it seems the software interface isn't as good.

I almost bought a 500, and ironically I had a Pro HD that is only 3 months old die on me today. They are sending a warranty replacement, but dealing with their "support" is painful. So, the reliability issues I can validate. I have had another Pro HD unit for years and it hasn't skipped a beat.

For those who see the siren's song of HDMI in and out, be advised that there are HDCP issues with it, and it is really intended for passthrough. Their own support video on setup alludes to the HDMI issues for streaming and suggests that you connect component also. Copy protection is just one big bag of hurt...

I have never tried Monsoon, but they just look like a cheap hack to me.

Then you are missing out. The current generation boxes are amazing - and they also power the new Belkin @TV. I stepped away from Sling ages ago, they are just not worth it. The five years of no innovation, $30 apps and lousy build quality were just too much to deal with.

I looked at the Monsoons a couple of years ago. Did they come out with new hardware (and software) recently?

I picked up a 350 last night. So far, the biggest issue I have with it is they force you to view via the website, instead of via local software like the older units. Not sure how I feel about that yet and people seem to be saying they have a lot of downtime with that website.

I myself haven't noticed a lot of downtime but I can still view my Slingbox Pro with the software and use that exclusively when I travel. For some reason the software doesn't work in my house on the local LAN and then I have to use the web site.

The ProHD/Solo were the last models/series to use the desktop software. The new 350, 500, and the Dish Network adapter all require web only viewing.