I discovered OS4 by accident, trying things out for the first time on distrowatch. Of all the distros I tried, OS4 was the only one that worked. A glitch in it(for me, a newbie) caused me to write to OS4's support. Support was excellent, and they told me where to get Black Lab. I got it, it installed over OS4, and is better while being enough the same, the learning curve is not too tight. BLL is now THE OS in the Given household, and Roberto is THE MAN. Bigg time kudos!
Stable work. Good product.