I use JT masks all the time and they are great. With the Flex 8 the entire ear and grill (the lower part of your mask) is one piece. So on hot days if you decide to go goggles only, you may be stuck without ear protection. Some people don't mind this. With the full head coverage, I find on hot days its just too much. To be honest I play a lot of paintball and airsoft, and while getting beaned every once in a while does hurt its not enough to make me want to wear full head gear. You'll get used to it.
If you're looking for an alternative you can try the JT Proflex/Spectra. Essentially the grill and ear pieces are different than the Flex 8. They come with soft ears (or hard if you go with the old school spectras) which are independent of the grill, so you have that added protection if you go goggles only.
I find overall JT thermal lenses are some of the best in the industry. I've played in 40+ weather with my JT's and never had a fogging issue. Like someone previously said just remember to change the lens every once in a while, ie when you see a crack on the lens or when the lens starts "peeling" (you'll see this on older lenses).
And like some other people have noted, you can use them everywhere as they're widely accepted paintball goggles.
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