We have had nothing but good experiences with Undercover Tourist. I would use them again without hesitation.
That said, since you specifically mentioned SeaWorld tickets in post #5, I will mention that SeaWorld hosts an annual Blue Friday sale on the Black Friday weekend. You can often get very deeply discounted admission tickets on that sale (in the past we have seen buy one, get one free or buy an adult admission, get a child's admission free, etc.) that would probably be signifcantly better than
UT's prices. If your trip isn't coming up super soon and you can wait until November 27th to purchase your SeaWorld tickets, then it might be worth waiting for those.