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Remember this: The phone or tablet you purchased is yours. It does not belong to the carrier that you bought it from despite the fact that the device is emblazoned with its corporate identity, logo or splash screen. This outright ownership you have in the device means that you can do whatever you like with it once you've walked out of the store, assuming you don't mess with the radio hardware and cause interference to your fellow users.
I have hacked and changed roms on every device I own for the last 5 years to suit me. I cannot resist not being tethered to corporations.
Samsung i8910 - Symbian
iPhone 3GS - IOS
Motorola Xoom - Android
Motorola Razr - Android
My Xoom has tried a new customized ICS Rom but it still isn't stable enough for me to keep, so using old Honeycomb till a later date. Works great as is for now.
Motorola Razr is very, very new and I only replaced the stock ROM with a International ROM recently because my Australian carrier ROM upgrade caused the phone to boot-loop. Repair was an option, but I take pride in fixing problems for myself if I am confident enough.
Newer ROM's aren't always better. Before I even try anything new I make sure I have a copy of the old ROM and research whatever I can to reverse or undo any new tweaks I am trying.
When it comes anything new, don't be in a hurry and never be first in line. When playing with any device, have a Plan B.