Need or want are predicated on what you
don't have.

But if you have or really like Model 19s or
Model 15s, then perhaps the only real
Model 10 consideration is the 2-inch version.

Buying as some have suggested at least
two Model 10s at "bargain" prices is a poor
suggestion when the OP could own for
that price-of-two a very, very decent Model 19
or Model 15.