I have used electronic earpro for about four years now and I love it. I have not used the Walkers. I figured it was a long-term investment and went with something higher end. I have a pair of custom-fit SoundGear Platinum plugs. I got them through an audiologist for about half the price listed on their website, which was still about $650. They are different than the Walkers in that their design allows for directional hearing. The microphones are oriented facing forward. Anything that doesn't have forward facing mics will not give you directional hearing, but not all forward facing mic set ups are created equal.
I use them most often for quail hunting and they allow to hear birds calling out several hundred yards, while automatically cutting off damaging sounds like gunfire. I also use them for range work and all my other hunting. I got them because I was struggling with long-term hearing damage. I've always used earpro at the range, but never when hunting. Problem is that some years I will go through over 250 rounds of shotgun ammo while hunting. The result is the mini-mariachi band in my left ear and a fair bit of high frequency hearing loss.
My take is that my SoundGear plugs are likely the best firearms related investment I've ever made. They've kept my hearing from getting worse and allowed me to continue doing what I love to do. They do however have some downsides. The big one is that amplifying background sound means you are amplifying everything. With normal hearing, your brain is really good at tuning things out. Not so much with amplification. Wind noise, walking through brush, your own footfalls, even your own breathing get ratcheted up and it wears you out. After a full day of bird hunting, taking those things out is just exquisite sweet silence. Still, I can track down scaled quail calling several hundred yards out and hear critters walking in the forest. So I guess there is a price for having a superpower.
One other thing on this topic. You will generally get better decibel reduction and protection out of muffs than plugs. I can't speak to the directionality of any plugs or muffs that I haven't used. However, the benefit of plugs is that they don't get in the way. If the comb of your gun hits your strong side muff, you can easily find yourself with effectively no hearing protection or amplification. So I am a plug guy for most usage. If I was using a braked magnum, I might think otherwise.