There are only 3 things I find frustrating about VCE:
1. You can't change values with numeric values. That includes <var:cl:score>, which should've been able to add/subtract to, but nooo.
2. When you spawn I think there's about a 5 second delay before you can use VCE.
3. If you make it do checks, and you literally have lots of VCE bricks around you, instead of the brick you look at making that event, another brick gets triggered, usually the one you are standing on or besides you. I really don't understand why's this happening.