IMHO, please do NOT buy Quick Extender Pro for the following reasons:
1) As-is, quick extender pro will NOT work as it does NOT compress the hanger to stretch your shaft. Main objective of that device is to compress the spring that in turn gives the shaft the stretch. Which it does not. That is the main reason they don’t have any male model demonstrating what the objective in their website.
2) Without modifying QEP with some kind of workaround, it does not work and it is really not worth that much money.
3) Some users here put in a lot of work to modify, but it is still a struggle as there are no clear instructions as such. There are some pics of it and I tried them, but it is still a HUGE struggle. I am still trying to figure this out on how to keep the springs compressed. Big pain in the bottom.
4) Moreover, if you just use the noose under your glans, your glans will go cold/numb after 30 to 40 minutes. It works without compressing the springs, but it is not really stretching using the spring’s tension.
5) QEP’s customer service is a full blown joke.
6) Use a product that comes with a male model demonstrating what it is or who provides good support such as Totalman or Penimaster pro or BIB hanger(amazing support from BIB). Though that has minor issues, there are clear instructional videos/support available from these two companies. Probably there may be others selling, but I came across these with male models or the forum support demonstrating the objectives with clear instructions.
My 2 cents.