Post robotic nerve sparing prostate surgery was given a cialis prescription and told to get a vacumn device and use it to prevent loss of length and function. Have bought several devices from smut stores and from a urology health store. The device from the health store is overpriced and quite poorly engineered in my opinion. The devices from the smut stores work well and are about 1/4 the cost or less of the 'medical' device.
Initially using any of them was incredibly painful. I have gradually become accustomed to using the device and the pain is now what I would call very mild pain or discomfort.
While the devices do cause my penis to grow some, it is not an erection and trying to use any of the constriction devices I have purchased is off the charts painful.
In variably after using any of the devices I end up with some discomfort for the rest of the day.

What is more of a concern to me is that I have zero desire for sex, I just don't care. Have tried manual stimulation and that's a waste of time and effort. Nothing happens, feeling is largely absent or painful.
I have had my testosterone level tested and that's normal so the implied reason for my absolute lack of desire is in my head. The surgeon has implied that but has not explicitly stated it. I would be far happier if doctors would just be blunt.