Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Definitely the way to go

I have ordered both the physical card (for gifts) and the online code - I have to say that THIS is how I will get my points from now on. It might not be instantaneous (though the online code is close - a few minutes at most in my experience), but at least Microsoft doesn't get my credit card info and auto-renew things on me at inconvenient times. :)I've also not had any issues with codes not working. - This is definitely the best way to get your points.