I got some spray from them to colour code my parking sensors and the colour is spot on, I've even used it (sprayed into the lid and using a brush) to touch up stone chips, etc.
MB touch up paint is £5-6 at the dealership. I've seen so many cars with touch ups that's nearly, but not quite right & it stands out like a sore thumb.
How much can you save when the thing only costs £6 anyway? Buy the proper paint.