I have just switched my camera in the garden from a homeplug to Netgear wifi adapter. It connected upto the superhub easily however initially it was even worse than the homeplug. It needs a 1 mbit connection for each users and on the adapter it was stopping for upto 20 secs at a time. On the homeplug the longest outage I have seen is 8 secs.
However it is now working perfectly since dropping the shub to one channel instead of two. I am using channel 11 which some have reported problems with.
I will have to revise my opinion slightly