I was referred to Tekna by a friend who's had their system for a little over 3 years. They love their system and the personal contact they have with the company (they call the company directly and locally). I was going to go with ADT but decided to hear them out (Tekna) and very glad I did! The representative was on time, very thorough, answered all our questions and beat ADT's cost by hundreds (about $450) of dollars.
We've now had our system for a little over two months. We just called our rep for a question on the system. We left a message and he called back 20 minutes later! Service like that should be rewarded and I'll tell anyone that asks, how great they are.