Like everything else it all boils down to your expectations. If you are happy with crap epoxy then who am I or anyone else to tell you otherwise? Some of us do have higher expectations, as someone who has been doing composites in the aerospace industry for a while and has been exposed to very high quality resin systems has driven me to seek out better solutions for my models as well. Yes I was once happy with hobby grade epoxies, once I was happy with West Systems. Since then I have gained a few years of experience and have sat through countless hours of training seminars. Those products no longer meet my expectations. When using higher quality materials I am able to design models with less structure for the same strength. In other words.....lighter.