Before I buy anything, I do a deep research on everything, but couldn't find many reviews regarding cases for multi-effects processors.
Then I found out, that POD HD500X perfectly fits this case, so I purchased this for mine.
All I can say is that it fits like a candy - perfectly :)
Really good quality case, the inside is medium soft, so no worries about scratches or visual damages to your device.
Has two pockets - the large one and small one in front, where you can put all your cables, PSUs, strings, picks or whatever - it has a plenty of space.
Comes with rubber "feet", so you can easily put it on ground not worrying about damaging the material of case itself.
You can carry it by hand + it comes with good quality shoulder strap.
10/10, very recommended!