The sensation you get after running a tobii is feeling like you've been up past midnight staring at a bright screen. Most people don't get that it's the eye tracker that makes you feel this way. Some of the other more respected companies take the amount of IR light placed on your eye balls seriously and try to drastically reduce it.
Talk to Tobii about it and they'll just bury it and say "there are no none health risks, or regulations about having that much IR light on your eye". Basically no one has set a threshold for how much IR light should be on a person's eye thus it isn't a problem "we should worry about".