The other Westin Ka'anapali properties in Maui are a bit more expensive, but as Denise says, you have a better chance of ocean views. You can probably sell them for about what you pay for them if you decide you want to get out. You may not be able to get much for your Nanea points. Maintenance fees are also a lot higher.
Another benefit of the other properties is that they are lock-offs that can be split to use them for two weeks in a row. I often stay there that way. Nanea only has full two bedrooms and a small number of 1BR units. The 1BR are hard to reserve, and you wouldn't have enough points to stay two full weeks. At the other properties you'd stay one week in the 1BR and another in the studio.
I felt timeshares were rip-offs before I first bought in Maui in 2002, before any of the buildings were up. I am glad I did and I have greatly enjoyed my ownership and the memories I have with my children. My daughter was 10 when we first went. Decided right then and there that she would want to get married in Hawaii when she saw a carriage with a bride in Kapalua. 15 years later, she did just that and now owns an aftermarket unit at WKORV South.
When I bought, I thought I would only occasionally go to Maui, but I could also go to nice hotels with a developer purchase. I travel internationally quite a bit so there was value in that. In the beginning, I could get a week at nice hotels, but since then the point values needed have increased dramatically while the points I get for turning a week in have not. Hotel exchanges are not a good value. In any case, I've been back to Maui every year. since. I could not touch a hotel, much less a suite with a kitchen and washer/dryer, for anywhere close to the maintenance fees. If you use the timeshare every year and can afford the cost to travel to Hawaii that often, timeshares are actually a very good deal. The ancillary stuff to exchange elsewhere and such maybe not so much. The Maui properties are at the top of the heap in terms of how nice they are. Almost all exchanges are kind of a step down, even if perhaps you could stay longer elsewhere or maybe get a 2BR for your Maui studio. I did just that once in the German Alps! The property was not nearly as nice as the Westins, though. Today, I would rent out my unit and pay for an AirBnB elsewhere if I didn't want to go to Maui.