I self installed gcm4140com broadcom chipset. The kit booklet offers several install options and I chose via Lan. I replaced a XB3 box with the XB6 due to Comcast offer of free upgrade. The whole process took 1/2 hr. It went totally painless, it even offered to transfer my old settings. I ran both xfinity speed test on 2.4 and 5 ghz channels using android tablet and win 10 laptop. I also ran a network analyzer app. Please understand this is totally my personal observations. My home is a 2story home in a large community with very close spacing and lot of neighbor radio congestion. I forced channel 1 20 bandwidth and 48 20/40/80 bandwidth. The 2.4 ghz channel works relatively equal to the XB3 as in -27 dbm in a given location in house. After XB6 install 5ghz went from -48 dbm to -30 dbm. Astonishing! The box itself has a very pleasing look and very small footprint, very low heat output compared to XB3. Now icing on cake; no more eye searing light tree display. We streamed 2 1080p films from 2 computers concurrently to 2 TVs and played games on 3 androids mixed bands and everything worked like a charm, especially I got strong 5 ghz all over house.
So, I don't currently own any AC gear and can't speak for that band yet, but this is the most impressive gateway to me, get one fast as you can, blows everything else away. This might sound like I am in any way involved with Comast, but I am not and feel they really hit the nail on the head here.
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