Sorry then, I only knew about the Pentium 2XXXs and since I was sure the E4XXX were Core2s I expected E5XXX to be Core2s as well.
Serves me right for assuming hardware manfuacturers would use logical names for their products.
Back to topic: I've just installed it and so far it seems to be alright. Only annoyance I've found so far: When playing youtube-videos in fullscreen the video will slow down when I move the mouse-cursor. Not too bad though for alpha-grade software.