Two people I trust have just taken the dive into the MacBook Pro world. Sami Shalabi and Will Raabe. They have both promised updates on their thoughts and how much they use them. Will tends to love his toys and will test out all the latest gadets I am sure. Sami is more the hard core coder and if Sami likes it, I know it will be a very good development machine (fast compiles and eclipse j2ee friendly).
If both of these people still love it in a month, then it will be almost impossible for me to resist ditching my 2 month old Dell and getting one.