You have to wonder what makes fish spook off a baited hook... is it a sight thing, or a detection of magnetic field...?
having watched carp spook off my rigs in the margins its hard to say, but when you use multiple metal components in rigs (and often different metals) I think the latter may be true to a degree...
my young apprentice is a dedicated fan of the Ronnie and we all know it works, but I think the Multi has almost the same presentation without the attendant mix of metals...
I think I shall experiment with the multi and the Ronnie side by side and see if one outscores the other....
I will even go as far as using plasticine as the weight, so the only metal content on the multi is the hook and therefore offers no scope to create a magnetic field...