sky hub 101

Thinking of getting a brand new sky hub 101 from eBay as there are quite a few for sale un used and cheap as chips, my question is are they any good ? compaired to my
System Details
Manufacturer Sagemcom
Model Number F@ST2304
Firmware Version 5.23.1a4N
ADSL Firmware Version A2pD030n.d23b

Also I presume I can put my own user name and password in it and it will work ?
How about sky...what if the original owner cancels sky then sky wants the router back..can they disable it because it has not been returned
I had a billion router for a week and have given up because of my lack of knowledge on how to get it working with torrents on my NAS drive

Thanks for looking