EVC model visa stamping difficulty

All,

I have applied for H1B this year thru a consultancy . I have paid expences for H1b filing . Consultancy said they would get a client letter and my model is EVC . I am working for an MNC in India having 3 yrs exp . I heard getting visa stamped with EVC model is not an easy thing . Does ppl apply in this way in which i have applied .