They are comfortable, inexpensive, tough and they do let the lower volume sound trough, not as good as amplified protection of course, but they work. I have used the EP4.
They do come sized and you might not get it right the first time, most people are a medium or large.
I have used EP3's for the last few years. I use them alone for outdoor ranges, and in conjunction with earmuffs when indoors. As stated, they are very comfortable. I had to buy both medium and large, and build my own set out of them. I needed the large flanges on the medium ear piece. After that, they fit and function like custom hearing protection. Definitely recommended.