I purchased BS36, BS37, and BS40.
These gels are incredible. They are smooth, creamy, and apply like a dream. No bubbling, flaking, or peeling. They are buildable, but their syrup/jelly opacity remains.
If you are looking for a syrup gel that you can build into a fully opaque gel, these aren't for you. BUT, if you want a true syrup gel, I HIGHLY recommend them :)