Yeah, Lexus is very strict on those survey. From what I heard, the only way to score bonus is if the salesman score perfect on all the surveys. As long as one has less than perfect score, his/her bonus is gone.
Here is an example of how good the service is. Last year my dad bought his RX300 from Longo Lexus, which is around 35 miles or so from my house (keep that in mind). He discovered that the car will make a whistling noise at speed above 70mph ( I think he is just being picky, it's wind noise), so he told the dealer. Because the car was brand new, they didn't know what the problem is, so it took us a few trips down there to eventually determind what causes the noise (the different spoiler you see in the 2000 model is the solution to this problem). Well, one of these trips was on a weekday when my parents had to work and I was off school, so I get to take the car in. Since they decided that they need the car for a while, I decided that I want to go home. Guess what, my parents cannot pick me up for another 4 or so hours and since I am under 21, no loaner car either. So they arranged a driver just to take me home (remember the 35 miles distance?). A few hours after that, they call my parents and told them that they will drop off a loaner car for us. Guess what, that afternoon when I look out the window, there is a brand new RX300 loaner car there. The car had less than 50 miles (after driving to my house). They left the car and let us drive for as long as we had to, until our car was done.
Now if you don't call this a good service, I don't know what is.