I joined SKY from BE on 7th Feb. I went the whole hog LLU, Sky Line and Sky Talk , etc.
Thankfully my experience has been great.
On BE my average stats were 6807 Kbps 1066 Kbps and now on Sky they are 7291 Kbp 915 Kbps.
This is despite all the official estimates saying a max of 5mb.
My testing is now over and has been set at 9mb down, 1mb up.
My stats are
ADSL Link Downstream Upstream
Connection Speed 8840 kbps 1107 kbps
Line Attenuation 39.5db 20.2db
Noise Margin 7.6db 8.5db
Only slight issue is some billing errors for Sky Talk 1471 but will deal with this separately.