I have a full silicone custom from starkey sounds really nice and comfortable to use and insert into the ear.
Can almost just smack it in the ear xD...
As i have own it for 2 month,( havnt use it to much since been on vacation for 6 weeks).
Im afraid that it will faster get torn apart then acrylic, if your not careful enough.
I guees it can survive some beating, not that i want to try it ><.
So im going sell mine to try something new like ES5 tho it cost alot.