I haven't heard of any of those problems personally, but anything bad regarding the 51m has to do with the (lack of) battery life and the heat output. Also, I believe the fan on those bad boys run constantly, even when the power is turned off.
These types of notebooks are not meant for road warriors - it's meant for people that have an LCD, a mini-tower case, and folding keyboards and still don't like the bulkiness. Hell I'd take one, the 3.2Ghz P4's and even the 3Ghz's are faster than my 3200+/nForce2, and Alienware even can upgrade the graphics and just about everything else for the cost of the parts, no more.
Have fun with your new toy!

P.S: Can I trade my 700 PIII/128MB RAM Gateway for that?