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I went with BimmerTech Alpha One and just installed the amp with the stock HiFi head unit and stock speakers on my 2009 328i E91.
The difference is dramatic. Like REALLY noticeable. I drove around this morning listening to the same 2 songs, first an MP3 on the iDrive hard drive, then on CD and then from my iPhone though the BMW iDrive adapter cable. Listening to Rush Fly By Night and Limelight. No surprise the MP3 from the hard drive sounded the poorest. Surprisingly, the iPhone sounded better than the CD.
After I installed the BimmerTech Alpha One amp, wow, the improvement was crazy. The sound just filled the space. With the stock amp, you can tell the sound was coming from the corners. With the BimmerTech amp, it was like the sound was coming from the dash or straight out of the windshield directly at me.
The install was super easy. If you love listening to music in your car and have $1,000, I definitely recommend the amp-first upgrade.
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2009 BMW 328i E91 Touring RWD /// M Sport | 6MT Swap| Alpine White | Beige Dakota | Apex SM-10 18X9 ET30 square | BMW Performance BBK Bilstein B8 | 3 SIM | Euro airbox | AA Headers and tune | Paint correction and 5-yr ceramic coating | LUX H8 189 Angel Eyes BimmerTech: Alpha One amp+10 speakers | Backup camera | CarPlay |