It doesn't sound very nice IMHO, Rio Grande do it on their Muy Grande pickups as do SD on the Invader and, as you rightly pointed out, on their Quarter Pounders.The magnetic field thrown out by such huge poles is actually counter productive as each interfers with the other and actually distorts the magnetic filed overall................the tone is overly compressed and choked sounding.A similar effect is caused in humbuckers with two extra flanking magnets run down the sides where the maple spacers should be......again on paper you'd think you'll get more power but in reality you don't, just a poorly defined tone with little or no dynamics.
