That is great news and thanks for sharing. Yes, the books are certainly designed to give that solo campaign/MMO-RPG experience, so I am pleased that they are hitting the mark. If you enjoyed the first two then I am confident that you will love Winter's Fury and Dune Sea!
If you're able to a pop review on amazon.com or amazon.uk some time, then I'd really appreciate it, to help spread the good news... (I note you are in India so probably don't have accounts with them, but hey - I ask everyone, as reviews really help with sales and boosting the visibility of products, as well as amazon promotions).
Cheers and keep us up to date with how you get on with the next two.