MB Newbie - EQA & MB Warranty

[Abc321]

Hi all, Mrs has decided (I think (&hope!!)) on an EQA. Will be 2021/22 year 250 AMG model. Sub 30k miles.

Anyone got one, things to look for, range, etc. I notice there was a model facelift around 2023.

Also, we would want warranty obviously. Merc are wanting £1,256 for 2 years which seems steep. Is 3rd party to be trusted? Again, any experience welcome.

Thanks!