Must be nice to jump ship from one latest phone to the next, haha! I still have a Hero and am STILL under 2 year contract. I reckon those doing this just sell phone A as a no contract, then use money to buy new phone at retail yes? That's awesome if so.
Regarding Samsung 'plastic phone' there's no question the build quality is better in the Photon (#1) and the Evo (#2); Floss points that out well (and is an amusing review of these 3 great phones:
Samsung Galaxy S2 Epic Touch vs HTC Evo 3D vs Motorola Photon Part 1 - YouTube
As far as battery life as a stock retail phone, every review i've read is glowing of the Galaxy s2 epic's battery life relative to the 3vo and photon, as are virtually everyone on the board here on androidforums on virtually anything about the phone. further, the fact that touchwiz is beefy is a testament to the fantastic processor because there seems to be absolutely ZERO lag.
Also, many reviewers (inc. floss) indicate the camera in the sgs2 is superior, and its a faster phone. The kicker is NO GPS Problems! Personally, I love that it plays so many video formats/codecs out of the box.
As far as updates, I care more about what's being released at XDA so yes, the carrier releasing a workable ROM is a concern for cooking... I guess I'm just going to hope that's Samsung's open-ness with this phone will transcend to faster major point releases of Android as it is their flagship phone.
again, it's exterior is cheap, but it's interior is arguably the best Android phone out right now. Guess I'll just have to be careful not to drop it as I am very much resolved to getting a SSGII!