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Love my E4 model, got it for ~1450 on gunbroker, to me it was worth more to be able to use my existing ar15 mags with it since I already have 40 or so of them and would rather they work in as many guns as possible. Also the standard 1/2x28 threading allowed me to mount my suppressor on it without a funky adaptor
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EDIT:
Just some some e4 models for 1299 on gunbroker... great deal!
Love my E4 model, got it for ~1450 on gunbroker, to me it was worth more to be able to use my existing ar15 mags with it since I already have 40 or so of them and would rather they work in as many guns as possible. Also the standard 1/2x28 threading allowed me to mount my suppressor on it without a funky adaptor

EDIT:
Just some some e4 models for 1299 on gunbroker... great deal!