I'm not saying that Dell's don't work...I'm just saying that they don't work well. I overstated it above when I said it's the, "worst laptop you can buy." I've never used an Acer, for example, or a Toshiba or Sony.
A more accurate statement would be, "As a professional in an IT field who carries several laptops and uses many different types of machines throughout the course of the day, the Dell laptop is without doubt my least favorite." And this is my 2nd Dell, so it's not a lemon issue. These are just cheap notebooks that are poorly designed.
They're heavy, klunky, ugly, have poor battery life, and run *very* slow when not plugged into AC. I'm talking about the Latitude line here, so maybe the high end consumer model has better characteristics, but in my mind a "business laptop" should be sleek and clean, easy to carry, and perform efficiently. My Thinkpad was great, and my HP C6400 is also pretty decent.
I'm not sure what you mean by the Latitude line regarding the above 'experiences'. The D630 for example, the closest in spec to the 15" Macbook Pro is far more durable, better built, lighter, better supported, runs for about the same time and what's more you get runtime options in terms of power configurations. It's not quite a Thinkpad but it's a darned sight closer to one than an MBP.