Google is inifinitely better than Bing, but XBox is tying it into their dashboard search. You will be able to say 'Big Bang Theory, Episode 4" and it will load for you. That's the only reason I'd use Bing.
Speaking of that, I joined GameStop's Power Up program or whatever it's called. Now I get daily invitations to contest giveaways which have websites I have to subscribe to to enter. I finally directed GS emails to spam, which is a shame because I enjoyed getting their store ads.
I was too lazy to get that many points for the PSP. I just kept cashing out a $5 Amazon Card whenever I had the points it took to purchase. I probably got about $20/month, not much. I stopped about a year ago, I got tired of having a clunky search bar on IE.