In my opinion, there are lots of good reasons to invest in electronic hearing protection. From ordinary considerations such as conversation on the range and clearly hearing range commands, to the unusual but vital such as catching a squib load, I consider electronic hearing protection to be almost essential for a serious shooter.
For what it's worth, my 2-year old $140.00 Peltor Tac 6's died during a recent week-long Gunsite course. The electronics in these aren't sealed, allowing sweat to permeate the batteries and circuit board, and this causes corossion (always needed to clean the terminals even when using only occasionally). I was able to fix one side, but that's intermittent, and the other side is completely dead. I'm out of luck on the warranty- 90 days.
Gunsite instructors all seem to use Pro Ears, and Gunsite keeps a supply of these to loan to students (quite important to be able to hear range commands, especially when in the tactical simulators) and I picked up a set of Pro Ears Dimension 1 slim lines from Impact Tactical for about the same price as the Peltor Tac 7, $170.00, which is a heavier-duty model than the Tac 6- only about $30.00 more than the Peltor 6. In addition the Pro Ears have a 5 year warranty.
The Pro Ears also definitely function better than the Peltor 6, in that they don't completely cut out during impulse noise as the Peltors do, so one can still hear a conversation.
As I found in an indoor range, they also completely cut down on echoes (not sure how, but they do) and this makes a substantial difference over the Peltors as well. In cases where you want to double plug, (50 BMG on the point next to you comes to mind) they still can help you hear much more than the combination of plugs and muffs would allow.
The interesting thing I found is that you can increase the sensitivity of the normal unit to that of the "stalker" model (made for amplifying sounds for hunting) by switching a jumper on the board. It seems the normal models are factory set for "medium" sensitivity, at least mine was.
Because of the highly accurate and directional aspect of the setup, you can tell both direction and proximity of a sound.
Good stuff, try some if you get a chance.