well for me they are verry bad at all times
on 64k they are about 300 constantly and on 128k they are about 250 but Quick says that my ping problems are ony limited to the few.
At first with Quick i used to get 80ping constant
well if i rember rightly dual isdn (homehighway) is £28 a month so you would have 128k, you can use one 64k line for internet and one for voice calls, or you can use them both for internet 128k or both for voice.
if you require 128k and voice calls at the same time you will need to have one normal line and one HomeHighway line making 3 lines in all but then you would be required to pay for 3 lines.
it is all listed here <a href="http://www.bt.com/homehighway/" target="_blank">http://www.bt.com/homehighway/</a>