If you're using a porter-cable joiner - these things are super-solid and make and "excellent" joint - I don't know how I ever lived without this joiner and these biscuits.  Read up on them - go to woodworking blog sites where pro woodworkers discuss joiners.  No doubt, you will come back to buy these.  So save yourself the time and just buy them - more time to work on your projects and get away from this computer, eh?  I don't work for them or anyone who sells them - I have nothing to gain or loose.  Just passing on the truth to fellow wood-workers trying to cut through all the bull out there. Simply put, these are the industry standard for a reason.