Roberto Amorim of RareWares has published the results of the public MP3 at 128kbps listening test with interesting results. As we can see, the latest LAME 3.95 achieves the best quality, which is yet another great achievement by this open source project. GoGo is a speed optimized variant of LAME and is clearly worse than the original. Xing performs much better than expected.
Read the full results and comments here.