I have used them to call my clients several times over many years now with no problems at all! They are friendly people who do what they say that is good customer service which makes me like their business even more than if it was just about money or profit-making potentials because of how much we trust each other when working together as partners/customers etc..
Nothing really bad except maybe sometimes some calls can be hard from time outs but not often so i wouldnt worry tooo much abt this issue either way digi corp does great work!! And its super cheap compared ot others out there doing similar things (like telecom).