I was testing a Thinkpad SL500 system at a local store and found the flexing of the keyboard to be quite a deal breaker for me; it was flexing quite prominently with very little pressure applied. I find it hard to believe that a business grade laptop should have this problem as a consumer grade laptop that I own (Dell Inspiron 1526) has very little keyboard flex and one needs to apply a lot of pressure to notice it.

Is this a common issue with the SL500 or SL510 models of Thinkpad laptops? What about the Thinkpad R500, does this also suffer from similar issues?