Anyone heard of this and is it any good?

Rode it some years ago when it was brand new – a mixture of existing rights of way and a small amount of purpose-built stuff. I haven’t ridden it again so it can’t have made that much impression on me. Worth doing if you’re going to be in the area I suppose!
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Similar to Neil did it a few years ago. It is a good cross country route in nice Borders scenery but not technical and not hard. I think the link over eggs it a bit!

I certainly wouldn’t travel a long way for it.

If you search the forum I think there are a couple of threads on it…

HTH.