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Apparently, the R1 and the R2 are very similar. The R1, as fun as they are, do not sound "correct". They sound a little recesed and "gritty". It is a cool effect, because it makes the soundstage deeper and gives you some analog feeling for classic progressive rock and so on, but I don't think that they are much versatile and precise.
I'm not so sure about many people liking them. Particularly after reading about their distortion.
If the R2 really sound like the R1, I warn you: they are very peculiar. They are fun, but they don't sound correct. The Delci sound much more correct and I imagine that thoy would be preferred by most.
And by correct I mean it as someone who has worked professionally not only as a musician, but also recording and mixing albums.