We have never exchanged RCI points, however, we rent surplus timeshares through RCI.
We have stayed at Mystic Dunes. It is a nice property, with large two bedroom condos. Some units are outdated, but overall, its a nice place with a lovely pool with waterslide. The location is great! It is right behind Windsor Hills, about a 5 minute drive to Disney Parks.
Regal Palms in Davenport is nice but about a 15-20 minute drive from Disney. The pool are is very nice. There is a lazy rive, waterslide, bar, etc... a nice resort feel.
Westgate Lakes (Turkey Lake Rd) was just okay for us. It is conveniently located to Universal and SeaWorld though. This resort was very busy and we received constant phone calls for the timeshare pitch. Since you are already owners, perhaps they would leave you alone.
We stayed at Star Island Resort last August. We were not crazy about this resort. There were renovations going on and customer service was far below average. The neighborhood around Star Island is sketchy as well.
We are staying at Summer Bay Resort in a few weeks. It gets good reviews and boasts many on-site activities for kids.
If you are looking for a close proximity to Disney, Silver Lake is minutes from Animal Kingdom. I have never stayed there but have driven by numerous times. IMO, the location of this property can't be beat if you are visiting Disney.
Hope this helps! Have fun!!!