I'm an owner at The Fountains. I've tried a few others like the Vistana, but I really prefer The Fountains.
The condos is around 1,400 sq. ft. with two separate BRs. The master has both a whirlpool bath and a separate shower enclosure, and in some units the master has a separate balcony. The other BR has two queens, and access to the other bath. That other bath is accessible from the common area as well as the 2nd BR (do they call that a 'cheater door'?). Also, I like the bedding, it seems like good quality to me.
I think there are 4 outdoor spas, 2 water slides, a big indoor-outdoor pool under the clubhouse and a really huge pool area. No lazy river. Both pools have food and drink, but hours can be kinda limited for the food and drink. You can rent pedal boats for Lake Eve, but I never have. There's now a Domino's pizza on-site, and a Benihana next door, as well as their own restaurant and coffee shop in the clubhouse (their food is reasonable, have eaten several times).
It' close to SeaWorld and the premium outlet mall on Vineland at the south end of I-drive. I have walked to the premium mall, it was about 15-20 minutes IIRC and there's a publix and walgreens across from it. I think universal is just under 15 minutes up I-4. DTD is much closer, on the other side of I-4 (but with some really long traffic lights in the way).
The I-trolley stops out front every few minutes, good for seaworld and aquatica, and all the outlets and malls on I-drive, but I think it doesn't let you off right at universal, but a short walk away.
I can answer any specific questions, I've been many times and learned nearly everything. My next trip is Feb 11-26, we're also going to Universal (got FlexPasses). So we can 'recon' if you need something really specific, too.
I guess the only thing I'm disappointed with is the hours of the pool bars. Oh, and my wife complains every time there are no scissors in the kitchen, although they claim they're provided. Maybe scissors just go missing often.