I was reluctant to upgrade from kp48 to kp49 but man, I'm sure glad I did.

I save around 30% battery usage with both vdd 1 and vdd 2 enabled (default profile 250-600) with heavy usage: online mode, watching videos with cutetube, music, email, emulation and mid brightness (3 bars).

My battery was averaging 5 - 6 hours with heavy usage (watching videos non stop) but now my battery averages 8 - 10 hours, again, watching videos non stop.

That's a huge bonus for me, so thanks everyone involved with this kernel, I'm gonna enjoy my n900 for longer now.