Being able to coast is very nice for your knees!
I guess it depends on your route. I don't enjoy fixed downhill (and obviously uphill it makes no difference), but once you've got a back brake I find it actually more knee-friendly than my other non-fixed bikes.
I've never tried back brake and fixed together. I agree, downhill fixed I'm not so fond of.
@ffm started
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Being able to coast is very nice for your knees!