I found it difficult to make payment so I used Moneybookers to manually forward payment to developer total process took 24hrs but it is worth it. I am sure payment system is a lot better now and automated.
All support has been provided to me by email, and is quite good. Support emails are replied within 15mins when I contact in Russian working hours. And updates are sent by email as well, which I prefer.
It is worth the money I paid and I am willing to pay extra to get personalized layout for our diamonds shop and further functionality because the developers are really trustworthy.
Diamonds and Solitaire Team