Tomei will tell you what ever it takes to sell you a cam, other people it's the placebo effect of it makes 10kw more up and at idle it goes "wank wank wank" but what most people forget to tell you is it makes 20kw less thru the bottom
But with playing with lift and duration in many set ups, we've (me, Mic, piggaz and others) proved that on low mount turbos the bigger duration cams make everything worse
An easy way to look at it is to increase response people increase compression and larger duration cams reduce compression
As a side note I thought so much of my type b pon cams I gave them away