to all those concern, i have used all the dual cores except evo 3d and optimus 3d, HTC Sensation has the best build quality second by Motorola atrix, however sense ui is 10 times better than any other interface, i know benchmark result of sgs 2 are better than any other phone but all other phone in real life are not as bad as benchmarks shows,personally i prefer a solid constructed phone since it should show the make or design perfection , not some cheap plastic. I know the power under the hood may be more for few phones but personally, atrix is the best overall phone with no issues whatsoever, battery time 3 days , then comes sensation. It is my humble opinion, and you may not have to agree with this. I have used all the dual cores and this comment is after experince 