I have wrapped a number of rods for Dustin over at DH that have had all models of his 3D printed handles and they are awesome. Most of my personal customers request them on all types of rod blanks. I highly recommend them! I also highly stress to my customers to never use Cold Snap rings aka casteration rings in general. Casteration rings do a number on Eva and cork, I would guess that the abs plastic that the handles are made from might not fair to well because the 3D printed handles are honey combed and not solid plastic. There are many options to attach a reel to a non screwable reel seat other that casteration rings or tape. As far as the grips feeling slippery I haven’t experienced that yet. Hope this helps.