$40 for refurbished? Yikes. I just want to make 2 comments;
If these are refurbished by MS, be cautious. All of my repaired warranty products have continued to eventually display the same problems again. Repaired and refurbished seem to be providing problem products with a different person and hoping they last beyond the warranty, like my 4th X1X console which is now bricked after having a HDD issue… 4 times in a row.
$40 for a refurbished is not a great deal. You can find controllers for $40 brand new. I have picked up a couple over the years under $40. I personally like this design, but I don’t think these were a top seller, so $40 seems steep.