I've had 10Meg since it came out..
I used to get 9.*Mbps
Now i'm getting slower by the day
I ran three tests from this site, each one getting slower (by the minute

)
Worth a call to NTL, or not bother?
Edit:
Fri, 21 Apr 2006 15:32:24 GMT
1st 512K took 2093 ms = 244.6 KB/sec, approx 2016 Kbps,
1.97 Mbps
2nd 512K took 1172 ms = 436.9 KB/sec, approx 3600 Kbps,
3.52 Mbps
3rd 512K took 1157 ms = 442.5 KB/sec, approx 3646 Kbps,
3.56 Mbps
4th 512K took 1328 ms = 385.5 KB/sec, approx 3177 Kbps,
3.1 Mbps
Overall Average Speed = approx 3110 Kbps,
3.04 Mbps
I also use netpersec, and i can see that my speed is all over when doing one particular download (say nvidia drivers for example, i used to get 1.2Mbps constantly) It quite rapidly jumps up and down, not constant at all