The fronts "upgrade" to E70 is mainly for modern looks but also allows you to change the blades without having to make sure the wipers are in center position as is required with the E53 ones. The front E70 wiper (I think driver side) requires shortening a little bit - a body shop did it for me for free since it's a 10 minute job to shorten it. They look modern and I've never heard them squark like the E53 ones used to when the wiper inserts get old - they're always quiet and smooth. So performance wise they're superior to E53 ones.

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.