I was switched over some months ago to 21CN, and as I'm nearly 4Km from the exchange I did not have high hopes of improved synch speed.
Well, to my very pleasant surprise, I was wrong.
Using my DG834GT and DGTeam firmware, I have tweaked my synch speed up to 5.5Mb/s. Prior to 21CN it was around 3.5Mb/s
The SNRM is around 3dB or less, and right now Routerstats shows 2.1dB. But the exchange end seems happy enough.
About once a week, bad weather will cause a resynch, and in a week it will typically notch up around 500,000 CRC errors.
But download speeds are great, and web access seems unaffected by CRC errors.
Have other 21CN users had similar results?