Chromecast 2015...activate it now or wait for a good promo from google?

So I bought the Chromecast 2015 model from BB since it had the 10 gc promo with it but I have yet to activate it as I have seen over the past few months some promos that Google does that they give you something free for getting a chromecast (like play store credit or movies or whatnot). I know about their 3 month Music promo, but I am not interested in that.    So should I wait for a good promo or just go ahead and activate it?

Thanks

IIRC, the activations promos also require the Chomecast to have been purchased during a certain period which is tied to the serial number. I just went through this with two I'd bought a few months ago.

Just activate it, Google usually gives out free movies/ rentals every few months. 

Ahh gotcha.  Thanks... I will activate it tonight.