I've created an adventure containing POIs with different icons (car park, hut, geocache). After upload they are all displayed with just a flag and hence look all the same.
What's more: in BC the geocaches are displayed as, well geocaches, with their very useful property window (they were downloaded as gpx from geocaching.com).
After upload they have become normal POIs and BC doesn't see them as GCs anymore :-(
Below is the original data I see in BC and here is what it has become after upload: http://adventures.garmin.com/de-DE/by/macfrank/wolfswarte/#poi-list