I'm using the B535-232, which I got over 200Mbps all day when i first joined Three (with no rabbit ears, just the internal antenna), which lasted 4 months before the downward spiral which its never recovered from.
I've messed around with the bands and 1 and 3 together seems the best overall. Its slightly faster with just band 3, but when contention strikes bands 1 and 3 together perform better.
The problems arise when using it for 4K streaming and the console which is totally unusable without 50Mbps+ speeds (ie
ut disc in, 80gb update required etc). HD isn't even possible some evenings (and always Saturday and Sunday), when this happens it drops to 480p on you tube or hangs 30seconds plus every time an advert comes on.