Based on the 2015 rMBP threads that I've read, there are two primary issues with these computers:
1. Screen quality - the consensus seems to be that the Samsung displays are better but scarcer, and getting one is hit or miss
2. UI lag under Yosemite - most likely a result of poor software design, which means that it can be remedied with a future OS X update
I'd prefer to see both issues resolved before replacing my 11" MBA, but that's probably not going to happen in the next month or so. For those who've already bought a 2015 13" rMBP, do you wish you'd waited?
1. Screen quality - the consensus seems to be that the Samsung displays are better but scarcer, and getting one is hit or miss
2. UI lag under Yosemite - most likely a result of poor software design, which means that it can be remedied with a future OS X update
I'd prefer to see both issues resolved before replacing my 11" MBA, but that's probably not going to happen in the next month or so. For those who've already bought a 2015 13" rMBP, do you wish you'd waited?