Replacing A Business Cd With Professional Cd Head Unit

[shadowface]

I've been wondering what do you guys think about replacing the standard BMW Business CD head unit with a Professional CD which was always an option on earlier 1ers?

I've heard there are numerous advantages behind upgrading to BMW Professional (Alpine CD73), such as:
- improved sound quality (the standard Business model has worse sound than a stock radio from my girlfriend's 2004 Micra SX);
- built-in Bluetooth for hands-free, and USB support (on certain units);
- better, clearer display;
- Cd Changer support;
- more built-in functionality, etc.

Did anyone of you have done an upgrade like this before? Is it worth spending around £150-200 to upgrade the head unit? Bear in mind, I love me some quality tunes (my glovebox is full of CDs).