I recently experienced two racquets (Yonex rds 003 and yonex rqs 11) which TW specs show to have the same stiffness value: 65. However, as a player of over 25 years, nobody can convince me that this is true... The difference is very obvious, rqs 11 is a very flexible, comfortable stick and rds is 003 is a stiff one that I could not tolerate after a few trials. Maybe the flexibility that I experience with rqs 11 may belong to the neck part while rds 003 is stiff at that point.. Does anyone know how stiffness values are measured and what may cause my dilemma???