I had never changed pedals on a bike before. My local shop recommended this tool and special grease which I also purchased. I watched a YouTube video produced by Park Tools. I went into the garage and no longer have flat pedals on my mountain bike! Cool!
For years I have used a ground down open-end flat wrench to remove pedals. Now, even that is not narrow enough for some pedals and the length of my homemade wrench meant that sometimes I did not have the leverage necessary. Enter the PW-5 the only reason I didn't give this wrench a 5 star rating is that I have used a PW-4 and that IS a 5-star tool! At less than half the price, the PW-5 does probably 95% of what the PW-4 will do and it is very functional for me.