Effective but just lacking that extra power
Used this on the red interior of my E92 330d M sport. Easy to apply, simply spray onto the leather, use a soft bristled brush to work into the material and stitching then wipe away with a damp cloth.
There was a huge improvement overall with the results being clearly impressive. What I liked about it most was that it was easy to work with - it foams nicely without becoming unmanageable and doesn't leave behind a sticky residue.
However, I gave it 4/5 as I feel it's just lacking in that extra bit of cleaning power. There were some marks and stains I expected it to shift but even after 2-3 repeated attempts and plenty of elbow grease, it just wouldn't.
Would still recommend as it's a great product for anyone to use without any hassle!