In all fairness, it DOES make a difference if you select the word as 'embedded' or not... if it IS embedded then you would get the results you have seen. Otherwise it would only list the individual usage of those words.
We've had a SECURUS box here for a while now, and it has been a good deterrent, and also bailed us out of a small number of situations where students have entered 'inappropriate' comments and language on various forums. In those cases, being able to identify the time\date\user has been a real boon. Catching those cases has /significantly/ improved the deterrent value.
As an aside, we've been using Teksys here for a number of years now, and it's almost like you guys are describing a different company... I have had nothing but excellent service from them and would have no hesitation in recommending them to anyone. They have been involved in several different projects here, and all the engineers have been efficient and happy to help with any aspect of the projects (as long as it's been reasonably relevant!).