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E-6 in general has been a pain in the ass. Of course the latitude is less. A lot of labs that will develop film will not do E-6 and ship it off somewhere causing an even longer wait. The process seems a little unreliable and the film seems more fragile in terms of heat sensitivity. I've had way more rolls of E100 come back with problems than negatives. Pic related is from a roll that the lab told me came out "thin." The whole roll was super-low contrast tan like that. I had another roll come back with lower than preferred contrast and a blue tint idk why.
My tip would be not to use it on something you need to come out in one try unless you like gambling.