Is Jalbum for iPad still useful? It looks like being sort of obsolete?
Anybody using it?

Not terrible, but certainly very limited. Images can't be reordered, and captions have to be provided when uploading each image. In short, editing an album is pretty much confined to adding or deleting images.

It also has some odd incompatibilities with "regular" jAlbum. For example, importing an album created with the iOS app back into the desktop version yields a very interesting directory structure!