I picked one of these up today as well. Apart from making a mess of cutting my micro sim down and then getting it stuck in the sim slot, and scratching the phone taking it out
it seems pretty dam good for the money. That said, coming from a Nokia Lumia 520, its quite a leap for not much money either!
Still playing around with it, and minus a sim card, but got my unlock code from ebay for when my sim arrives and also got all my apps installed that I want. So far, i'm impressed with it!
/edit - if anyone has a spare unactivated giffgaff sim around the Stafford area, please let me know, I could do with it asap! thanks