Time is currently more of a limitation than product. I also want to do more Bluetooth stuff as there's a lot of promise with some of the BT headphones I've tried lately. Unfortunately I only have a few free hours per day and some days those are spent entirely answering PMs, comments, emails, etc . I don't see that changing any time soon so I don't know. Maybe shorter reviews with fewer comparisons are the answer.
I don't have the VSD3, only the VSD3S. If my experience with the VSD1/VSD1S applies, the difference between them will be nearly impossible to tell unless you get both an A:B them extensively. I think I am getting some Sidy models but not sure which. I'm not managing to keep up with all of the Chinese brands anymore. There's like 5 new ones this week.