Anyone have any experience with Night Time Bedwetting Enyresis Alarm? Any recommended brands and stories to share?

DS just turned 6 and we were at the well check out at the pediatrician's. I told him that he is still consistently wetting his pull up every or every other night. He recommended us to purchase an Enyresis Alarm, and recommended the NightHawk brand.

I googled -- while there are several different bedwetting alarms on amazon that is around 25-50 USD, the NightHawk bedwetting alarm is $156 ?! So I am curious to know if anyone has experience with it, and if there are different technology to justify that big $ difference. Or if the cheap one work just fine. And any other suggestions on night time "training"?