50% increase in 3years and a hex core laptop? Don't ask for much do you? CPUs are a mature product now. The days of 20 to 40 percent gain and a worthwhile upgrade with each generation are gone. You may as well get used to it.
If that so, I'll stop here and stay with the old school. Until they release some dramatic improvement like Sandy, they won't see me spending money on their crappy increases.
The only improvement is the i5 who are quad Cores.
So... Anyone who has an Sandy Bridge i7 MQ to avobe don't need to.upgrade.
However people who has an i5 can.move to the real Quad Core