As a player I experienced this module MANY years ago so when I realized it was available in POD format I was very excited to get my hands on a copy and run it for my own group. In my case, I unfortunately found that my memories of how great this adventure was was heavily influenced by how much my own DM had invested into and embelished the module.
Ghost Tower Of Inverness is at its core a fun challenge-style dungeon that is well worth a play through. Having said that where it ages poorly (in my opinion) is that the trade-off for it being a challenge-style dungeon is that it is light on flavour, background and meaningful hooks. If a DM wants to run this as part of their own campaign it will require a lot of padding out and some consideration if you aren't playing 1st Ed with the pre-generated characters.
Having said all that, if your players like an old-school challenging dungeon that is less well known (and less mean spirited) than Tomb Of Horrors this might be the perfect adventure for you.