Here's the thing about that chip, It's not really an XP-M. It's a socket 754 Athlon64 with the 64-bit capabilities disabled. In other words, it's a socket 754 Sempron @ 1.6Ghz. And as such it will perform slightly lower then the other socket 754 Sempron (3100+, it operates @ 1.8Ghz), but will still be a serious contender.
I have a "2800" that runs at 1.6Ghz, surprised they have a "3000" at 1.6ghz as well, anyway, it is VERY nice, and I have a bit of an upgrade path, I can upgrade the unit with a new mobile a64 down the road and have those 64 bit functions.
I just bought a R3306US after rebates for $850. At that price it is a steal. As far as the processor goes, it is a POWERNOW chip from AMD. On the laptop power scheme it idles at 797Mhz and will use less battery power. Put it on the ALWAYS ON power scheme at it will always purr at 1.6Ghz. On this setting it runs hotter and uses more battery power. Overall a good package.