I also prefer cork........For starters, I nail down my track, and nailing on the foam is horrible. I tried some foam, and I had much more trouble bending it on the curves (it wanted to crinckle along the inside edge). It can also be an issue after you ballast......I used some on an NTRAK module, and due to the amount of handling, any time the ballast got any pressure, the foam would give and the ballast would crack and flake off. The foam IS much quieter though.