Starter pack for Black Knight?

Yes, especially if you missed him. 4 dollars for a GUARANTEED 5*, and an amazing one at that, is a very good deal if you can afford it. And if you can't afford it right away, I think it's there forever like the free Brave summon? Regardless, he's definitely not a regrettable purchase in any regard.

Eh... I mean. Sure, he's a good unit. The problem is that many people get tired of using Armor units unless it's in Armor Emblem, or with a Guidance flyer. While Black Knight is a good unit, he can be a bit underwhelming unless you have a unit dedicated to lugging him around through the map.

(Not to mention you get other things along with the pack, and it's only...$5?)

Get the pack. Not even for the Black Knight. It's one US dollar more than the cheapest orb pack, and you get three times as many. So it's already worth it there, and the rest is just bonus stuff.

I did it for the orbs. BK and Light's Blessings are a bonus.

I missed the TT so I bought the starter pack. If you missed it too, it wouldn’t be a bad idea to get it. You get a fair amount of other stuff as well.

It's a good value.

Definitely do it. I nixed my F2P status and became 42P (thank Alethia for that little acronym) because I wanted a third BK. The orbs and other stuff were a bonus.