I have an IGH on my folder, Shimano Nexus 8-spd and it works flawlessly too! Yes, changing flat you do have to disconnect the gear change cable and they re-connect it when you're finished, but the way it's set up it's pretty quick release so not a hassle at all.

The reason I like it for the folder is that it's overall cleaner than a derailluer system though mine still uses a chain rather than a belt, which would be even cleaner.

Rick / OCRR