I'm very happy with my NSRs, simply because the NSR is a great bike (looks, engineering, build quality etc) and so rewarding to ride at full chat, its regardless of engine size or stroke type (and I ride Superbikes as well).
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30