"Never judge a razor on its first outing"

...I've never encountered a razor that disappointed me on first shave, and then miraculously
started to delight me as I continued to use it more and more.

Conversely, every razor that I've loved impressed me right from the first go...and continued to
improve as I used it.

I am sure others think differently but this is my opinion.

Share your thoughts, please.

I fall into that camp as well. I loved the Gillette Tech & Schick Krona from the first stroke. Same for my first Schick injector, a G 1 Model. There's a good reason these razors were incredibly popular in their day:  they worked.

Despite the forgoing, I still think it’s good advice that someone give their new razor a fair chance before demanding a refund or posting it on the BST.  

Perhaps if both seller and buyer are located in the same country, return window is generous and postage efficiency is predictable,
this sounds reasonable.

I agree.  Theres several factors in play.  I'm in Canada and International returns are just a pain so generally I won't even buy the item in the first place if its big ticket or has a higher than normal likelihood of satisfaction issues.  Take that for what its worth, but seriously, when the cost of return shipping can be more than the cost of the item and then theres having to deal with tax and duty refunds etc etc etc.  So point taken.