Effectiveness of bedwetting alarms?

Several years ago I went back to wearing cloth diapers and plastic pants (totally by choice) and unfortunately became totally dependent on them. Needless to say it was not a good choice and I have since managed to retrain myself during the daytime. After a almost year of trying to night train, I still wet every night. Has anyone had any experience with bedwetting alarms? It seems to be my last hope.