I have and use The ordinary Buffet but find Aldi's Q10 Serum much better. I ended up using both (together) but found I have found no difference if I leave the ordinary Buffet out.
I have dry skin and also use Clarins Beauty Balm and a Bobbi Brown foundation, Chanel powder and Clarins blush and eyeshadow too. They're all the best I have found.
Clarins Beauty Flash Balm, their eyeshadow and Aldi's serum are the three I will stand by though. (The rest I am sticking with only cos I paid money for them rather than their worth)