I had the same reluctance about Dell. I have a consumer model now, and am not happy witht the general quality. But this Lenovo situation has given me serious pause about the company, and I think the D630 is the only viable alternative. Recent CNet reviews (5/24) give the the Dell a non-neglegible advantage over the T61. Not that this makes the Dell a better machine, but it makes me feel better about going that direction.
The clincher for me is that my school has a service agreement with Dell, so if I have a problem with the Latitude I will simply be able to take it to my school's tech dept and swap it for a loaner while they work on my machine. Couple this convenience with the poor experience thus far with Lenovo, the great reviews for the D630, the D630's outperformance of the T61 in most of CNet's benchmark tests, and the fact that the Dell is cheaper, and I think the Dell makes sense. For me.