Im going to be changing to xilo adsl max premium soon and wanted to know if anyone knows the kind of ping times i should expect
Unless it triggers a retrain on your line (and you have interleaving at present), it won't make any difference unless you are routed differently.
The factors which influence ping
mostly on UK ADSL connections are: Interleaving on the Line and ISP Routing.
What people are saying about how far you are away from the server (As long as it is in the UK) doesn't really make much of a difference.
For instance, back in 2010 before IPSC was rolled out on my connection, I used to get a 13ms ping to the BBC and a 12ms ping to my exchange so it took around a millisecond to get from the exchange to the BBC.
Now in 2012 on 21CN, I have an 8ms ping to the exchange, and an 17-18ms ping to the BBC due to new routing. Both the old connection and new connection was/is on FAST.
Exchange to the internet is still mostly fiber, so it isn't a limitation there.
As I said it won't make a difference to your ping unless you have more priority on a congested DSLAM, your line is switched to FAST or you are routed differently.
-------------------------------------------------------------------
Downstream Upstream
Connection Speed: 24276 kbps 1211 kbps
Line Attenuation: 16.5 db 6.4 db
Noise Margin: 1.1 db 6.2 db