In the some of the drills and scenarios guns end up on the deck a lot, just not once in a while. Much of it involved combatives with a drawn gun. If I were doing regular stuff then I would not worry about the occasional dropped gun.
Even with the insert the front sight of a pistol will cut the hell out of your hand during weapon retention/disarm drills. Before we had blue guns we use to have to wear gloves.
Lots of what we do is dedicated to when and how to deploy the pistol from disadvantaged positions. To do this with force I prefer using a blue gun. When it comes to the running the gun the barrel insert is a great tool. - George
I totally agree, if you take your training seriously, you need a dummy gun (aka BlueGun), for all the reasons outlined above - especially for weapon retention/disarms training.
I'm pretty sure I've posted about this before.
I have a few laser inserts, and I'm considering buying a SIRT gun. Both Mid-Atlantic and Dukes Defense has them; thanks to both for letting me examine yours (and sharing the training tips!).