Sadly we left them around two years ago. Only because they haven't and have no iintention of producing a Linux client. We tried running under Wine, but that broke on upgrades, we ran some third party clients and they did the same. And bottom line if you want it to become mission critical then supplier support is non-negotiable.
Its a shame and we used to recommend it to all our clients. We no longer do so there is some lost Windows business. Committing to any product nowadays that locks you into particular operating systems would seem short-sighted in my view.
My other worry was possibly the reason Evernote would not port was that its design was locked down too much to the OS making a too expensive exercise to bend it to the small but significant Linux market and may send warning signs to Windows & Mac users about future and legacy support.
We found good alternate cross-platform solutions - but using a combination of products. Evernote was a good unifying product which simplified stuff for the user.
So farewell and good luck - and if you now produce a Linux version its too late for us, and i guess, for the others who had to leave them.