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I've been looking at these frames too, the only slight negative I've found is that they have limitations on the chain rings they accept due to the dropped rear stays
Virus recommended a 44/30 for a double but I think they'll accept 34/50 from the info on wiggle and a 40 for a 1x although I've read they'll accept 38 and 42 1x.
Strangely for a CX frame a 36/46 set up may not be possible
friend of mine has one, he loves it. Currently riding on 40mm tyres too.