I work at a small planning commission as 1 of 2 GIS people, where we have 2 ArcGIS licenses. A volunteer recently starting working with us. He is using QGIS and mostly editing shapefiles. I probably should have considered this question first.... Do ArcGIS and QGIS play nicely together? Ultimately everything will end up in ArcGIS, will there be any issues editing shapefiles or geodatabases in QGIS and then opening and/or editing them in ArcGIS? I don't know if I am pushing it here asking another question... If map annotation is edited in QGIS, can that map be opened in ArcGIS?
I work in an environment where we use both softwares and here are my impressions. I began to use QGIS about a year ago when I finally became fed up with paying for additional extensions and licence levels. I find QGIS to be good for manipulating data and getting it into more open source friendly formats while ArcGIS is much better for Map creation. That being said there are limitations. you can open file geodatabases within QGIS but not personal (to my knowledge). avoid multiple users editing a shapefile at the same time (I usually have one for each user and merge them together periodically). I don't believe annotation in QGIS will come over but I could be wrong.
that being said i have never experienced a problem editing shapefiles in one and then opening them in another and with the money you save on another licence... jet ski.