Hi Jashan,
I have two site using the plugin. This is from the generated widget code for the site with version 1.10.11 standard:
<div id="sidebar" class="sidebar widget-area">
<div id="ai1ec_agenda_widget-2" class="widget widget_ai1ec_agenda_widget">
<div class="widget-wrap">
<h4 class="widget-title widgettitle">Upcoming Events</h4>
<div class="timely ai1ec-agenda-widget-view">
<div class="clearfix">
<div>
<div class="ai1ec-date">
This is the generated code from the site upgraded to version 2.0.4:
<div id="sidebar" class="sidebar widget-area">
<h4 class="widget-title widgettitle">Upcoming Events</h4>
<div class="timely ai1ec-agenda-widget-view ai1ec-clearfix">
<div>
<div class="ai1ec-date">
You can see that #ai1ec_agenda_widget-2 and .widget-wrap are not in the version 2 widget (before the h4 tag is called.) I use .widget-wrap in particular for styling the site.
Thanks for your feedback on this!