Written on: 14/06/2013
I have the most simple case: iPhone 3GS locked for AT&T. It took 2 days to unlock it. For that I've paid 30GBP which is a reasonable price in the case.
The phone is indeed unlocked now. I was able to update it from iOS 5.1.1 (jailbroken and unlocked) to iOS 6.1.3 (not jailbroken, not locked) with iTunes without an issue.
The guys are not scummers for sure - they do their business. I can't say for everybody else but for me it worked flawless.