First Time PR landing and AVR re-entry into USA


We have valid I-797s for H-1Bs but visa stamps in passports are expired. Instead of having to go through visa stamping at US consulate in CA, we are planning to go by road and re-enter US through AVR (Automatic Visa Revalidation). Some details about AVR in following links:

I wanted to know about recent experiences of folks with AVR re-entry into USA. Are there any risks involved?