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@ewanmac
I think that the longer cage on the apex derailleur allows the use of the super high range apex cassette (11-32T), which is why people are using it. I doubt a rival derailleur would work with apex cassette.
An apex derailleur would probably work with rival/force/red cassettes - but there wouldn't be much point because you wouldn't gain any additional range in the gears.
Part of me thinks it's a shame SRAM invented apex as I'd have loved to have seen Bertie on a triple! That said, apex may be the perfect option for my girlfriend's next bike.