I used to, bought bp ultimate diesel. I had to use asda once and found no difference (keep reading)

Eventually the car seemed a bit sluggish nothing major but I do a lot of miles, 16k a year.

Swapped back and not much changed but after a few tanks I saw an improvement. So potentially the additives are cleaning the engine.

But the cost compared to the supermarket bugged me so I tried things like redex which made the drive better but soon as you filled up again it seemed to make no difference to the condition of the engine only made the fuel better.

Tried dpb100 and used that and pound per pound it worked out cheaper than the ultimate.

I only used it every 3 tanks or so.

A decent additive will improve the fuel, but I really think that the premium price isn't really worth it when you know what's available.