Are the hex conversions for the B4.1 (front and/or rear) really worth it?

Trying to sort-out need items versus want items for my B4.1 build and the only advantage I can see right now is that you "capture" the roll pin on the rear so you cannot lose it (assuming you are using the clamp-on style hex piece from JConcepts or Proline).

Thanks in advance.

JB