yep, they made it prettier under the hood. My gut instinct when i see the different methods of weight relief is to believe that the prettiest looking weight relief is the best, BUT i have no evidence to support my instinct.
I have done a shoot out between a 2001 & 2008 LP & could not find anything negative worth mentioning. No feedback at high volume. No Lack of sustain. The tone is slightly different but not in a bad way, just like every LP has its own sound.
I can say that before the shootout I was very skeptical about the chambered LP, but it holds its own with the older model. In fact, the newer standards feel better due to the "plekd" set up, ergonomic neck shape & lighter weight.
As a singer I have always prefered the sg over the LP as it has less influence over posture so the lighter LP works for me.