The hebie chainglider is not for use with derailleurs. There is, however, a hebie product that I ordered from the UK, that works okay with a front/rear derailleur-- it says that it can be used with a triple. I am not sure this is really true. I only have a double on a vintage mixte bicycle, and it works for me with my 46 tooth larger chain ring set up. I have not tried the sks chainboard, but I have read that people have problems getting into the granny gear with it on a triple. I think the hebie is more attractive/looks more retro and provides better coverage for my chain and chain rings-- it is also light and durable plastic. It would be hard to break. I would never go back to chainguardless riding though. I love just hopping on a going with my pant legs a-flutter.