Good overall, not perfect
I have only used this a few times, because in general I try to avoided glasses, but I am fairly impressed with nerdwax.  It does seem to do a decent job with keeping my glasses in place, but I do have to regularly push my glasses back up.  (However at a decreased rate).  I do have fairly heavy and large glasses, which I am sure play a role.  I do also tend to sweat a lot, especially when wearing my glasses due to the decreased airflow around my face.<br />Overall, I would buy nerdwax again, but it isn't necessarily a 100% fix for me.
Rating: 4 stars