I figure I have 12-15 FF memberships.
It MOST CERTAINLY has a huge impact on who I fly with as I have attained status on some. For example with AC I can most always fly J class for a discounted Y fare (at time of booking).
Dorian
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Star Alliance RTW Price Chart:
http://www.informationlab.com/rtw.htm
Star Alliance Comparison Chart:
http://members.home.net/deercroft/starall00.html