I am with Xilo but on their LLU service via C&W. On the service I am on, they are resellers.
I cannot comment on the service you want to subscribe to but their tech support is very good. I had a tiny issue after joining, phone was answered quickly and problem dealt with immediately. Others, who are with this isp say that tech support is also fantastic.
I was previously with Fast.co.uk whose tech support was fantastic and I would have to say that Xilo/Uno are just as good in that area.
Good Luck