Very tempted as a puddle light in the door and would be very practical (reminds me of the old Mk4 days).
Can I ask does, that mean you literally just take off the current red reflector and there are wires behind which you can plug the loom into and that's it if you have the illuminated sill?
No... so firstly you need to establish if you have illuminated door sills.
If YES - The Door Ecu is already active and this is why you need the wiring harness they supply
If NO - If means the Door ECU needs re-coding to activate the power supply.
But I was told the fitment instructions cover both scenarios and he provides full technical support.
The have full images and look quite simple... the difficult bit is if you need to re-code the door ecu but again he can provide contacts of people (at least in UK) who can do that for you.
But either way the door pad comes off ... but the instructions tell you exactly how to do it.
I think some even have videos