Everybody has a slightly different shooting style and mine did not fit the SB as well as I hoped. I found that I could group better with a Hoyt Ultratec than the Switchback so I decided to move on and order the Ultratec. Since I shoot competition, it is critical that groups are tight and everything is comfortable - for me the Hoyt was better.
See the attached E-bay link.
http://cgi.ebay.com/ws/eBayISAPI.dll...e=STRK:MESE:IT