No opinion on the service, but thought I'd post this cut/paste to save others the time:
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What is Sling TV?
Sling TV is a new live TV service that allows subscribers to watch a collection of cable TV channels on their TVs, computers or mobile devices. These are live TV channels, just like those offered by a cable or satellite TV service, except they're delivered over the Internet.
Although Sling TV is a subsidiary of Dish Network, the satellite provider, it's operated as an entirely separate service. You do not need a Dish subscription to get Sling TV.
What does Sling TV cost and what does it include?
The base package, called "The Best of Live TV," is $20 per month. It requires no contract or commitment, and you can cancel or suspend service at any time.
The package includes 19 channels, most of them basic cable staples like ESPN, AMC, Disney Channel, TNT, History and HGTV. Add-on packs, each $5 more per month, are also available. You need to subscribe to the base package first before you can access any add-on channels, so Sling TV's minimum cost is $20 per month.
SLING TV PACKAGES
Package Price Channels
The Best of Live TV (core) $20 per month ESPN, ESPN2, AMC, TNT, TBS, CNN, A&E, Lifetime, History, Food Network, HGTV, Travel Channel, Cartoon Network/Adult Swim, Disney Channel, ABC Family, IFC, H2, El Rey Network, Maker, Galavision
Sports Extra $5 SEC Network, ESPNEWS, ESPNU, Universal Sports, Univision Deportes, beIN Sports, ESPN Buzzer Beater, ESPN Bases Loaded, ESPN Goal Line
Kids Extra $5 Disney Junior, Disney XD, Boomerang, Baby TV, Duck TV
Lifestyle Extra $5 truTV, Cooking Channel, DIY, WE tv, FYI, LMN
World News Extra $5 Bloomberg TV, HLN, Euro News, France 24, NDTV 24/7, News 18, Russia Today
Hollywood Extra $5 EPIX, EPIX2, EPIX3, EPIX Drive-In, Sundance TV
All of the above channels are available now aside from A&E, History, Lifetime and H2, which are all coming before the end of March 2015, and FYI and LMN, which are "coming soon."
What about other channels?
Only the channels listed above are available on Sling TV.
Major broadcast networks, namely CBS, ABC, Fox and NBC, not to mention PBS, are not included. (And let us note, for the record, that CNET is published by CBS Interactive, a division of CBS.) Numerous other cable channels (like regional sports channels, Fox News, Bravo and Comedy Central) and premium channels (like HBO, Showtime and The Movie Channel) are also absent.
If you don't want to pay for cable TV, many of those absences can be addressed separately from Sling TV. The broadcast networks can be had for free (in some areas) with an over-the-air antenna. You can also get TV programming via broadcaster web sites or services like Netflix, Amazon Instant Video, Hulu Plus, CBS All Access or HBO's upcoming Internet-only service. And many individual TV programs are available within 24 hours of airing on services like iTunes and Amazon, if you're willing to pay by the episode or by the season.
How can I watch Sling TV?
You'll need to subscribe at Sling.com and set up an account, then install the app on a supported device.
Sling TV is currently available (or not) on the following devices.
SLING TV DEVICES
TV devices Roku (TVs, boxes and streaming stick), Amazon Fire TV and Fire TV Stick, Xbox One
Mobile devices Android phones and tablets, iOS phones and tablets (iPhone, iPad, iPod Touch), PC and Mac computers
"Coming soon" Chromecast, Google Nexus Player, Android TV devices (select 2015 Sony and Sharp Smart TVs), Samsung and LG Smart TVs
Not available PlayStation (3 or 4)