When I found DPCalendar, I wasn't quite sure it was what I needed for the site I'm currently developing, but they answered all my Pre-Sales questions so fast and clear that I decided to purchase the Subscription. Let me tell you, best choice ever.
Working with DPCalendar is great, simple, and the results are amazing! And if you happen to get into some trouble, you have absolutely nothing to worry about cause the support they give is clear even for beginners, and must importantly FAST! So you wont lose time waiting for their response, which means, no time lost working!
If you have doubts, simply dont, you'll love DPCalendar.