Great advice for the majority of the time, but with Fast Pass+ possibly being introduced soon, right now might be the exception?
FP+ will in some way be tied to the tickets (possible pin code?) and possibly require tickets to be purchased directly from Disney, leaving services like Undercover Tourist out in the cold? Maybe this is somehow tied into the rumors of pre-June price increases. If your happy with the current FP system and don't care about FP+ I'm sure its safe to go the
UT route, but if you have any interest in FP+ you may want to wait.
In case you don't know about FP+ is, based on the rumors the user would be able to preselect online, up to 60 days in advance, 3-4 FP+ tickets a day per day. Beyond that not much is known yet and even that not set in stone.
We are going in mid-June and I personally hope the system isn't fully running by then, but want to keep the option open.