I have had the hard, custom molded, filtered ear plugs at work. About 2011 the company tried them out because they were sold on the fact that they would be more cost effective in the long run. We each got molds made, and were given one set of filtered plugs and one individual communication earpiece to use with our UHF radio. The results were less than impressive.
The first thing is the plugs are only good for 2-3 years, or less if you gain or lose 10 lbs. The molds were stored by our provider, and could be remade if needed.
The reception by the crews were sharply divided. They were either the greatest thing in the world (about 20% of the users) or the worst thing ever. I fell into the last category. The plugs are HARD, they are not at all like the ones you can get made instantly at the gun show. They are really noticeable in the ear, and maybe not the best for a high temp, humid environment. Worse, they seemed to move when I spoke or moved my mouth, etc and I could then hear the loud machinery noise around the seal. The filter feature made it seem much louder than the 33NRR plugs I normally use, so I wasn't 'sure' that I was getting the same level of protection.
I do love the communications earpiece. The speaker goes into the filter, so that blocks that noise, and it makes important communication in a loud environment much easier.
I kept the other plugs for air travel. They do a pretty good job of blocking engine noise, and the filter in them allows for pressure to equalize during takeoff and landing. They are seeing less use as I use my Bluetooth OTE earing protection so I can listen to music or the movies.
That's my humble opinion, your reception could be much different. Ask for a 100% satisfaction guarantee. For me, I can buy a lot of EAR Classic Superfit 33 earplugs for the price and be a lot more comfortable