It is a personal thing as to whether you feel you want/need them, and personally I'm more than happy to say I'm glad I've fitted them to mine :driving:
So, like most jobs on these cars it's down to your own view on value for money.
There are two ways of doing it, and I've done both
Firstly a disclaimer; You don't need a screen for parking sensors, both of my video's show them connected to screens but you can just have the audio side of it.
So this is the aftermarket version. I connected them to a screen as I used a combined parking sensor unit that had a camera input as well...
https://youtu.be/j-I2KSQxYb8?si=WYF3YeB3TGdAdRsZ
You can get kits that include the front sensors as well.
Later I decided I wanted the OEM PDC system for the rear and front and integrated into my iDrive (again this is perfectly OK working with a standard radio and no screen)...
https://youtu.be/l866Wneykws?si=NF-bYJzBPY3iX3yP
Fitting-wise it's not too dissimilar between them, you've still got to remove bumpers, run wires etc it's a lot cheaper for an aftermarket kit and no coding is required, whereas the OEM PDC will be more expensive to buy the parts, even with used items, and you do require to code the car for this to work.
Hope that helps
