This update is a "speed bump" pending Santa Rosa chips being available in sufficient quantity and motherboards being debugged with them installed. But for a "mere" speed bump, look at what you DO get. 802.11n, which is a big deal for wireless users. Slightly bigger HD, iSight, which is a "fad" thing, but "free". 20-30% faster performance. For a speed bump, that is massive.
- I am pretty sure all Core 2 Duo Mac systems had 802.11n anyway, so no change on the Macbook. Big deal for wireless users? Not really, 802.11n is still uncommon.
- iSight was already present.
- 20-30% faster? From what, 130MHz core increase on the base model? The more RAM on the base model would have that affect in usability but it certainly will not be massively difference speed wise than its predecessor. Keep in the mind the Apple benchmarks should the difference to the original Core Duo Macbook, not the just replaced Core 2 Duo Macbook.
So no, not massive.