I've got the SmartHub 2 (I've subscribed to the BT Complete WiFi package). Can't say if it's any better or worse than the SmartHub 1 (which I had no problems with), but a 2 is needed to work with the Complete WiFi discs. If it's only the router you're interested in, and you already have the SmartHub 1, probably not worth changing IMO.
there is little difference between them but major difference is you cannot split the networks now probably to do with complete wifi discs I have 1 disc and has helped improve wifi in my home
I ordered one last week, turned up within 48 hours, only took a couple of minutes to set up & am getting speeds of 70 - 74 mbps, I've had no problems, the old hub used to reset itself every so often but this had been stable for the last 6 days..I haven't set up the Wifi yet as I don't really use it.