Remote central locking kit

[Duchatelet]

Hey all, I have a 300E with key central locking but have seen kits which turns this into remote central locking and wondered if anyone has tried these out and if so are they worth the money, where/which best to buy, I also have a Laserline 911M alarm system fitted but the remote handset is missing, anyone know where I can get more info and a new handset for this system?
Many Thanks