My brother had one when we were little. He's 2 years younger than me, so take this for what it's worth, and it was about 30 years ago. He was 8 and would just sleep so deeply that he could not tell when he was starting to urinate. The alarm was supposed to go off when the 1st drop of urine touched the bed, to wake him up so he could get up and go to the bathroom. I would say it helped keep the bed dry. Whether or not it helped him LEARN to get up, or if his body just matured at around the same time, I can't say. Good luck!
Kelly, wife to DH, mom to Caden Reese (10-2-06), Tessa Brynn (12-26-08 ), and Maddox Quinn (7-16-11). Fur-mama to Finnegan, Ripley, Raisin (my little kitty amputee) and Kimchi. 748/2011, 2028/2012, 2023/2013, 1256/2014, 353/2015