The support is great: very timely, looking at your problems and finding solutions. They are also active at enriching their modules with new functions when appropriate based on on new ways users are implementing their modules. So very responsive.
In terms of functions, the complete set of modules and extensions is very rich. (one possible point of improvement would be on the documentation aspect of the various modules due to the richness, may be under a wiki format?, but the support is very helpful on that aspect).
My next exploratory step is to look how to include a complete new template to some modules (but there already are the "custom css" and the "custom layouts" options which are included into the jevents component and which also palliate possible conflicting css between the template of your site and the integration of the component).