I bought a Ko Olina EOY even, with usage beginning in 2006. Since then, I've used the lockoff option three times, for a total of six weeks. The lockoffs have traded extremely well (2BR at David Walley's, 1BR at Willowbrook Lake Harmony PA and 2BR at Westgate Park City). We've used the 1BR's at Ko Olina. Our experience has been exceptionally good.
HOWEVER, I can say that the timeshare has made no sense whatsoever from a financial point of view. Our EOY cost $17,000 in 2004, and has lost at least 50% of its value. I know this because I just bought another EOY for $8500. As a forced reality check, I've computed the real cost of these six weeks:
$17,000 at an opportunity cost of 5% x 6 = $5100
50% lost of investment = $8500
Maintenance fees, approximate total over six years = $4200
Fees: approximately $600
Grand total: $18400, or $438/night (for 4 1BR stays and and 2 2BR stays). Most of these stays were not in high season, either. Obviously, we would have been way ahead to simply pay the going rate wherever we wanted to go.
I feel better going forward, now that our resale is lowering the average nightly cost. But it still isn't exactly cheap. I'm pretty sure I'd do way better to shop the TUG/timeshare rentals. Still, we do love Ko Olina, and as long as we get a good shot at the inventory as it become available, we'll stay on board.
P.S. Why the opportunity cost? If you hadn't given the money to Marriott, it could have been earning that 5% from a bond or a utility. Opportunity cost is a real cost.
What really is an "investment" in the context of vacations? Money, or time? I have no idea. If you are actually going to use the accommodations at Ko Olina, then I'd say over the long haul, you'll come out ahead compared to paying retail. Renting is cheap right now because of the slow economy and rotten real estate market. If the economy and real estate markets grow, rental costs may go up. Same thing can be said of the values of these deeds. I know mine is taking a beating. For example, my one EOY was bought for 17k in Maui, and looking on Redweek at resales, I want to vomit. Not that I purchased this deed for financial gain, it does make me sick thinking about what I could have bought it for if I had waited. But seriously, who knew? It's all hindsight. Same for my ocean front. That thing went for 36k via developer pricing. Of course, I would expect that I'd come out ahead after 5-6 trips. Just my opinion. Maybe I'm wrong. But I plan on using those trips.
Maybe I'm drinking the kool-aid here when I say that for me, it's worth its weight in gold knowing I have trips for a life-time and I can pass the deeds to the kids.