I've heard very good things about the response and tone of the Spirocore low B. All the Toronto guys use a Spiro E/C, and most of the 5ths guys are using a Spiro for their low C. I agree though, bowing an E/C (I've mainly tried the Spiro as mentioned above) is much easier!
I think the brightness traditionally associated with Spiros for bowing is something we can appreciate on the really low strings that need all the help they can get to speak.
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