I too have lasers on all my small carry guns.
They help in sight acquisition and given the LCP is so short that helps. Yes, they are a real help in training.
My LCP with Crimson Trace is my most carried gun.
(I can shoot it with out the laser, too). Grip activated, easy to install, it's like it's not even there, so small.
Proud Ruger & SIG owner in the Free State of Arizona!