Talyns,
Unfortunately the way you laid out the experience window at the current time will cause problems due to bugs in the vitality system. You may or may not want to change it but I wanted to make you aware of it at least. Currently the UpperMarker and LowerMarker DD tags return a mouseover tooltip indicating how much exp you have. These tooltips are broken and only update when vitality updates. Because you have the LowerMarker widget overlaying the 1/10ths exp bar, the player will be unable to mouseover that bar to get a proper readout on exp. Now with your exp bar since it shows exp in numbers on the bar anyway its probably not a big deal but again I wanted you to be aware of it. The default UI has this same layout problem though i've shown them how to fix it
The other issue you will have is I see you put a small raw vitality progress bar along the top, but then overlayed the UpperMarker on top of it. So once again the tooltip from UpperMarker will block the tooltip from vitality so you will be unable to mouse over vitality to get the reading.
Like I said in the case of this exp bar since numbers are listed anyway the mouseovers are probably moot, but I wanted you to be aware of the issues so you would have all the information.