Having owned 2 of these for the past half year to clarify some of the questions above:
BEFORE YOU BUY: For the love of Mary please, please check your WiFi upload speeds can handle this system otherwise you won't be getting the maximum (If any) use from the Canary!
Free 24 hours of retained recordings when movement is detected only (I.e. Unlike those familiar with the Nest Aware subscription, the Canary will not continuously record video for you to later view and scroll through. Recordings are made only when motion is detected by the camera)
This free 24 hours can be split between 4 devices maximum (E.g. If you have 1 Canary it'll be 24 hour retention of recorded clips, 2 Canary's you'll get 12 hours & etc.)
There is no limit to the number of recordings you can download & you can bookmark recordings to keep them permanently displayed in the app as long as you get to them within the time period before they're deleted
You can purchase 30 days of storage from Canary instead of the free 24 hours they provide but it's pricey and not worth it in my opinion, currently £12.99 for two devices per month [They will send you offers on occasion so hold out for these if you want extra storage)
This is not suitable to be pointed out of a window to view outside. As mentioned by another HUKD member the infrared LED's will reflect and dazzle the camera view
Whilst this home security system doesn't continuously record you can view live-feed wherever you are 24/7
You can manually turn the cameras off & on - Another user talks about leaving their home and waiting for their Canary to register this to begin looking for movement (This is called geofencing) but this is an optional feature.

Note when people refer to 12 hour recordings and maximum limits of downloading/bookmarking clips this has now changed to the above

I've bought myself 2 more and this deal deserves so much heat. Cheapest I've ever seen it was for £110 this New Years on Amazon. Thanks for letting us know OP! :innocent:

Edit: Formatting

What an interesting device...

Great price. Had mine for over a year now, highly recommended

Just be aware of the subscription fee to Canary...

61 x 1 star reviews

Recent reviews are not good

Still not a good ratio.

I've got two of these, they really are good. Subscription fees only for the advanced service which keeps recordings longer than 24 hours (edit: other posts say 12 hrs, it's been enough time for me to review alerts and save them if I want)

I don't think it's needed, you can download any clips and save them / store them / email them etc.

You just said it, 12 hours free cloud storage, what do you think happens when this time depletes?