Is it necessary and helpful for potty training to buy this thing? I need recommendation!

Yes, I have this urinal for boy and it is very useful for him to pee in standing position. I think it is a step to train boy to use urinal in male public toilet in future. My boy get very interested to pee in this device and in a way it helps in potty training. I got mine from qoo10 for about $8. http://list.qoo10.sg/item/SUPER-SALE-MADE-IN-KOREA-NEW-POTTY/409511096