We just uploaded new version to repository. In this version we implemented word completion from dictionaries and created UI for managing User dictionary and Ignorred Words.
+Note: This plugin does not have dictionaries on board. You must install also plugins: "Spell Checker English Dictionary", "Spell Checker German Dictionary" or/and "Spell Checker Russian Dictionary" to enable spelling for language you need.
The word completion feature still beta, and we will be glad to any feedback about it. Also we have a tracker:
Sergiy Dubovik and Alexey Efimov