Hi guys, just out of curiosity I did some simple speed/quality comparison between cycles and SLG (shame it’s no longer developed). Someone on this forum said, that cycles is MUCH faster than SLG and gives better results - well, in my opinion they are at the same level - SLG gives better results IMHO… 
run on W764, i920 + GTX570, 300 samples, ~20 sec. in both renderers.
CYCLES:
http://www.pasteall.org/pic/19804
SLG:
http://www.pasteall.org/pic/19805