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You will gain on the top end but will lose in the low to midrange. This may not be an acceptable tradeoff to people who already feel the low to midrange is weak on these cars.
The more aggressive cams increase valve overlap, which bleeds cylinder pressure. This is most noticeable at low to mid rpm when valvetrain action is slower. On the top end, this negative effect is not felt and the more aggressive cams help breathing and exhausting. Boost leverages naturally aspirated gains -- the cams that add 10 rwhp naturally aspirated might add 15 rwhp at 7.5 psi boost.
I am not sure I would do the aggressive cams on a daily driver supercharged E90M3. I would consider more aggressive cams on my turbocharged E36M3 that makes over 500 lbs rwtq at 4000 rpm since it has midrange power to spare.
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