Since 2003 I am professionaly working with Dell Latitude Laptops (D600)
May I suggest that the keyboard which is used on the E5550 and my current E5570 is not the most comfortable one.
Never made I so much typo's as in the last years I used this new style.
The best keyboard yet was on it's predecessor, the Latitude E6540. The amount of typo's is way less as in use of the current keyboard.
This I want to share with you and I'll be happy to help you testing new developed Latitude products.