OpenGL glIsEnabled Calls

Im still a super newbie in openGL so please correct me if i am wrong on this. From the couple books i am in the process of reading they all make mention that you should try to reduce or eliminate any calls to glIsEnabled and keep the state yourself in your own code. I see a lot of calls like the following in sio2:

Code:

      if( !glIsEnabled( GL_BLEND ) )
      { glEnable( GL_BLEND ); }

Would there be a significant advantage to keeping state in the sio2 struct instead of querying openGL?

yes that can be done... however glIsEnabled will check the client state on a GL_CONTEXT basis held in the client memory (and from what I understand in software) so basically Im not sure that the speed gain will be significant... but still worth the try...