I bought SuperReceptionist number few months back. I am very happy with the services. Here is my experience:
1) Buying was a breeze. I did not have to do much. The sales person explained the features to me. I did not need too much information as I already had tried a competitor product and struggled and in the process learned everything about the tollfree numbers.
2) I got a call from their team. They took information from me and set the number up for me.
3) I continue to receive monthly calls from them to understand how I am using the system. They even helped in publishing my number on my website and justdial. I was very happy with the proactive approach.
It is a big company with most reliable services among everyone who provides cloud telephony. It may not be the cheapest but it is well worth the money you spend.