|Hi Phil, have to disagree with you|
I have purchased psu's for various laptops, never one from the maker as they are far too expensive. Have recently been using an oem one for a Dell Inspiron.
I never buy the cheapest, but carefully select the best oem version for the purpose, making sure they it is correct for the laptop concerned, with preferably higher output amps than the original.
The model number(s) on the original psu, should be used is ff possible, to find a compatible psu.
Todate, not one has given trouble.
Good luck - Keep us posted.