I've had the superhub for about a week now (with 100mb) and frankly it is a load of toss.
Speeds on wired vary from 65mb to 97mb, and wireless is a waste of time unless you are sat in the same room.
I have done all the usual shenanigans like turning of ipflood and firewall, I even ran the dir615 with DDWRT off of it for wifi, but that made little difference. I have to reboot on daily basis and it's doing my head in.
When it works it's great, Downloads hitting 8-9MB/s, but I can't be assed with the faffing about. My old 50mb modem + router setup was better, but virgin took the modem when they fitted the superhub. (left the dir615 though)
If anyone can point me in the direction of a replacement cable modem/router that will work with virgins 100mb then please do.....cost is irrelevant.
Getting this tonight depending on the server:
But is has been as high as 97Mb, and as low as 24Mb.