As a self service survey creation tool, it lacked question types and logic functionality found in SurveyMonkey/SurveyGizmo etc.
As a self service panel tool, the functions of panel management was not up to par with some other providers. Almost prefer to jet let the VC rep/team do most of the work you typically would do yourself.
There were functions such as panel feedback and communications that was not even mentioned or shown to us until after we decided to stop using VC for our needs.
I had better experience using VC as a full service provider when I first had a chance to work with them 10 years ago. Most recently, using VC as a self service panel management experience was very disappointing.