I have the Flex 8 Helmet.
I love it.
My buddy bought one, it pinched his nose, he gave it to me so I have a spare.
If you want ventilation and cooling get it. While its not as comfortable as the JT Flex 8 goggle its close.
Its actually the same exact frame - but the helmet makes the goggle a certain shape, whereas when you have the mask without the helmet the goggle conforms more to your face.
Having taking numerous hits to the helmet, and goggle - it rocks! The only down side in my book - its not made here. Then again, I don't think anyone is making masks here right now. (JT Assembled in Mexico) and Valken made in Canada.