I hope they don’t screw the auto OC. I have never OCed but my motherboard did decide once that my normal default core frequency of 3.2GHz was too low, and did an automatic unstable OC which resulted in a nice and high 1,2 GHz -__-. I had to switch it to a manual OC, and then back to automatic and it was fixed.
I don’t know what the extended warranty price is in your region but for me with my XPS 15 9500 I would recommend it. The repair guy has been at my home like 5-6x. Stuck pixel screen replacement, factory trackpad defect > replaced > which caused the fingerprint reader to stop working> in the end it magically fixed itself. Use the phone line with your “premium” support the whatsapp helpline fucking sucks.
Besides that it is an amazing laptop, I love it.