I installed one on my 228i a few weeks ago. It definitely makes the car pull harder and helps reduce turbo spool up time since boost levels are generally higher across the board. I wouldn't call the benefit drastic, though -- it's certainly not noticeable all the time like a JB4 or a performance ECU flash would be.
It's basically like a kick in the pants by someone who can make a 60-yard field goal instead of a kick in the pants by someone who can make a 55-yard field goal.
Is it worth $300? Yep.
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--Life is a journey made more exciting with a fast car.--
--Helmets are for closers.--
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