bear88 said: "I don't want to sprint around Manhattan before showtime or fretting all day about the tickets, so I'd rather have them in hand before we eat dinner (or even in the morning). Is that reasonable?"
StubHub is safe and not much to worry about.
However, buying from StubHub can be about convenience or price, but you have to decide which is more important. If you wait for tickets to go down in price, someone else may buy them for their convenience, and if you buy them when it is convenient, they may not be at their lowest price.
It sounds like you want convenience AND a low price, but you have to pick one. If you want to enjoy your day and not run around, buy the best tickets at a time that let's all that happen. If you want the best price, oh well, so much for your convenience, you have to watch prices all day until you decide you found a winner.
Also, you may be limiting your options by needing three tickets to a show anyway, as most people have pairs and StubHub can prevent you from buying one ticket and leaving a single, so that can also affect things. I know when I sell on there, you have to buy both tickets or none. So be sure to select 3 as your quantity, and it will filter the options to where you can buy three tickets together. That may reduce a lot a seeming options down to very few.
Another thing to consider, if you get tickets on there that are for PickUp, that may also be easier, as the StubHub pick-up office is at like 40/7. And there have been reports on here about people getting in line with cash and buying a lot of tickets, so sounds like scalpers are also using hard tickets for this show, and they are definitely going to be flexible on price. So, don't worry about Pick-Up, that could be a great option. Plus, you wouldn't worry that they are fake, since you're getting box office-printed tix.