We went to Aulani for a week and returned home just before Christmas. I haven't had time to do a proper trip report but will add that I agree with most everything written here.
IF I were tempted to buy at Aulani I wouldn't do so until the final phase had opened and we had a better feel for how the resort feels when at capacity. When we were there there were plenty of pool chairs and beach chairs avaiable during the week and the crowd levels felt perfect. It was busier on the weekends when it appeared more locals came to visit.
Speaking of locals, we did notice that seemingly half the people there appeared to be local residents and one woman shared with us that there were some very good incentives and discounts available to locals currently. It makes sense for the resort do to this - for many good reasons. We did notice however that there was a different feel to the crowd between the folks who were on vacation versus those who were having a fun weekend getaway. Both perspectives were good - it's just that we felt the difference.
Also about a third of the vacationing people we saw there were Japanese visitors and they were very fun to talk to, too.
Finally, I agree that the soundproofing BETWEEN the villas was stellar. BUT for us a huge design flaw we noticed was that there was basically no soundproofing and no privacy anywhere within our villa. For example you could hear every single sound made in the bathroom throughout the entire villa. We had a baby with us and it was soooo hard to manage in the villa and not wake her up. We finally learned to open the windows to the outside sounds and also run the very loud kitchen fan for white noise.
The doors between the rooms - including the bathroom were shutter style. Only they were literally shutters in that there was now solid material in between. So if you peered upwards you could see through the door.
Also there was no lock from the shared bathroom into the master bedroom. AND you could actually see down through the shutters from the vanity area onto the Master bed.
Needless to say it was not a very romantic vacation. Next time we might as well just get a studio.
Anyhoo, besides those negatives the resort was stellar - not in the greatest area - but AMAZING within itself. We also adored Oahu itself once we got out of Kapolei and Honolulu. We will be back for sure but not every year.