I look at it this way, the products with cashbacks are cleverly advertised. The real value is closer to the cash-backed price, but it looks more attractive if an offer of some return is made. It catches lots of people into supplying them with personal data for their marketing info if they offer it with a "cashback" which you have to enter your data for. So for me, if I see £50 cashback I reckon they value your data at £50. They will not miss the £50, but what they could potentilly do with the data en-mass is much greater.
I'm weary also "registering" products for guarantees. Half the time you seem to be covered already under the terms of sale.
The experts in the media can't really make it much clearer -copanies value your data. There is NO favours on your behalf, no matter how good it looks to you! If somethings offered for "free" they get somethng else fro you.
I don't touch things with cashback unless the original full price is OK (e.g pretty much never). However, it looks a nice camera so I hope you're happy with it. I just picked up my Nikon D300s for about £1,000 less than the first person bought it for and I have the retailer warranty (limited time), and still the base Nikon warranty. More spec than I ever will need, although it's not the lates model.
....Sorry, that's OT, enjoy the camera! It's always nice to have new buttons to play with. Don't have to wait for processing now so no excuse for trying every setting on a new toy. No regrets!
Rich