We wanted to add, replace, and make more "user-friendly" our existing security camera system. From the walk-throughs, demos, quotes and work, we have been completely satisfied and impressed with this company. The owner is accessible and his crew are polite and professional. The price is right, but more importantly, I have happy, positive feedback coming from my school principals, which means so much! I would recommend giving Sentry a call if you are thinking of installing or updating your school security cameras!