Not yet. But honestly, the latest few updates have been great! Navigation between docs is much much better, pinch to zoom was a great addition, and screenshare is now better than on any eink tablet.
In general, I haven't felt like I'd reaaaaally need bookmarks since software version 2.8 (but that's a matter of taste).
I use a Fujitsu Quaderno (was from Sony). Similar idea, no epub support but pdf links and bookmarks, on device search? These all work.