i put my router in the living room so 5ghz reception in bedroom is poor (separated by a RC wall). i bought re450 hoping to boost the reception a few weeks ago. it comes with standard uk plug. the body is only very slightly warm, running much cooler than my router.
in my bedroom, 2.4ghz actually sees a drop in download speed (48Mbps vs 34Mbps) but 5ghz is much, much better (18Mbps vs 110Mbps). latency is a little bit worse overall (3ms vs 5-19ms).
i'm using 1000m hkbn and r7000 as router.
all in all, better than i expect for $585. hope this info helps.