We had limited success with P.I.. Been on this program for 1 1/2 years. Before this we used a device similar to potty pager for about 1 1/2 years also. My son is 8 1/2 yrs. old. We have just recently stopped milk at dinner and this has made a difference. 4-6 dry nights in the last couple of weeks. P.I. wants the child to consume a good amount of water before bed but we have found that this has not worked for us. I do allow 2-3 oz. while brushing but anymore than that causes a problem. He seems to void within the first hour and a half. If he can make it through that time, he can either wake himself or hold it till morning. We take it one day at a time. So the jury is still out for us on P.I.. We'll keep you posted.