On a rifle, they are fast and easy. There's no learning curve to them. On a pistol, there's definitely a learning curve. You need a fair amount of practice to get fast with one. There are some that have a giant ring just outside of your sight picture that will help guide you in. Mainly the Holosun 507 with the ACSS reticle. That is a MASSIVE help to someone new to pistol red dots.
https://www.primaryarms.com/holosun-...t-acss-reticle