I got SV Studio Pro through DLsite because I needed a discount and Dreamtonics' most recent discount opportunity expired. My impression is that the website works very well, the serial system is good, and the company has a clear system for refreshing the serials. But I probably won't do it again because the only way for me to get money into the website was via the point system, because traditional payments are limited for overseas customers. If you lived in Japan, it'd probably be a no brainer for people buying the engine.
Still, I saved a bit over 30 USD, so it's something.
Just wanted to share the experience if anyone else is thinking of bargain hunting like I was.