I love my 7510 and I'd definitely recommend it, but the keyboards are a bit of a lottery (this probably applies to all current Latitudes and Precisions, as they all look to use the same boards).
There are two different designs that I've encountered, with one of them being massively inferior (noticeably mushier feel, and a weak point on the arrow key clips that gets worse over time, until the clip starts 'expanding' under pressure, causing it to get stuck or pop off of the board).
No coil whine on my one at least, but maybe I'm just lucky.
I doubt weight is much of a factor for most people considering one of these things, but yeah they are a bit heavy (they can take a lot of abuse, though).
