Is it Worth it to Get the Castle Shield Series?

[Lance]

i tried experimenting

i tried spear spin then use castle shield with a shield.
they stack,
but it does not the other way... meaning when u turned on castle, and hold the spear, it cancels

doesnt work anymore

[MrFudge]

the thing about this series is i find it only useful if im gettng hit by a lot of mobs, if not then i absolutely never use it.

other than that, i only have the first book on level one, while im hoping to max out the second book for a great blocking ratio cuz you only need 1 level of the first book

the third book i dont think im gonna get, but who knows.