I'm looking forward to a native Linux client. I use the web app on Linux whichis much better now (for me) when it works with Firefox.
I find the web app ok for working with notes but where it lacks is for organizing. AFAIK (please correct me if I'm wrong) it is not possible to select multiple notes to move them to a notebook, for example. Or to tag notes in batches. Maybe this is possible in some of the other versions of the web GUI but I don't want to move back and forth.