There haven't been any major issues, it's just been glacially slow. Most software running on capable CPUs is still 32 bit, Visual Studio still doesn't have first class support for 64 bit and my MacBook still runs a 32 bit kernel.
I expect ARM's transition to be quite different though--with the highest ends of their business moving in only a couple product cycles, and the lower ends of their business sticking with 32 bit indefinitely.
I expect ARM's transition to be quite different though--with the highest ends of their business moving in only a couple product cycles, and the lower ends of their business sticking with 32 bit indefinitely.