Revision A Apple projects have had issues for as long as Apple has been making products. Second gen Macbook Air's had Logic board issues, 2007 era RevA Macbook Pros had video card issues, dodgy graphics cards on the early Mac Pros, the iPhone4 antenna, the list is endless. Often it's taken years for the issues to be resolved and Apple to pay for repairs, if at all. It's simple, if you want the shiniest tech, buy what…
I never had an issue, and despite everyone at my office having iPhone4s and 4Ss, the only time any of us were ever able to affect antenna-strength was having a wet hand, and then purposefully applying a lot of pressure to attempt to attenuate the case.
It could be the signal-strength display "fix" was hiding issues (actually, this is almost certainly the case), but in practice, it was never an issue, and the 4 had consistently better signal than any other device I've owned, including a GalaxyS2 since the iPhones could get a good enough signal in elevators that previous phones (both iPhone and Android) didn't.
And despite being the same basic design AFAICT, never seen a mention of the issue with the iPhone5.