Hi
My line in maxed out at around 35mbps, so I guess stats could be useful.
I can't find much about the 8924's wifi however, if it's better or worse than the vr900.
I'm not sure suggesting one boxes Wi-Fi is better or worse than another is useful, reason being is due to standards they all work very similar. What changes things is the antenna arrangement and how the signal radiates from the box and the directions favoured by that particular design on any particular model. So a box that has great range for one person may be bad for someone else.
Oh and the marketing that suggests these routers track and beam the signal to the device is very creative marketing, that isn't how they work, to work like that they'd need very directional antennas that move around with a tracking device! All they do is simply radiate the signal in the same pattern but delay very slightly the transmitted signal from one antenna by varying amounts of time until the receiving device reports it has a stronger signal. It works on the basis of ripples in a pond and two stones are thrown in, some ripples will cross and cancel each other out, some will meet and amplify, and the aim of "beam forming" is to make the ripples meet at the devices antenna so they amplify. Of course throw more than one device onto the Wi-Fi network and it rapidly becomes impossible to do this with any great certainty.
What I can say though with the 8924 is I've not had any problems with AC on the 8924, all devices connect just fine and just work.
Regards
Phil