I have done Undercover Tourist for a number of years, they are legit and reputable, and I've had good customer service with them. But, this time I'm going with Parksavers .com, also legit and reputable. And, at this time they are a better deal than UCT. I'm buying a 7 day park hopper (also equal to the buy 4 day ph/ get 3 days free that they have available), for $370.98! Saves just over $53 dollars over buying at Disney. This promo must be purchased by March 31st, btw. They send a voucher you can redeem at the park, and they also send a code that you can use to link your tickets to your
MDE, just as you would if you bought from Disney. The voucher is mailed within a few hours of purchase, the codes are mailed in about 72 hours after purchase, so keep that in mind in regards to your 60 days booking for FP+. If you plan to link your tickets to your MDE, you won't need the voucher anymore. There are a few recent threads on this in the last week or two to see more info.