1. You need to wear proper wrapping and padding to wear it without discomfort. After about 1 hour you need to take it off for awhile because your dick feels fatique, after about 1.5 hrs you feel you really need to take it off(!), and if you were it longer yes, you will feel pain.
But most users including me wear it for 1 hour sessions at a time, take it off for awhile (I use it every second hour, so about 1 hour break in between), then you won´t feel pain, but like I said, you need to use proper padding.
My padding tips with pics can be found in this thread:
http://www.mattersofsize.com/forum/showthread.php?t=27599
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Another very good brand is the Fastize [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]extender[/words].