And how you would describe SVN version playability and bugginess in relation to 0.1.6?
It's barely even a comparison. A huge number of old bugs have been fixed since 0.1.6 was released and the mod is more stable than it used to be. The only reasons that I can think of to play 0.1.6 over the current SVN build would be if you don't have the new vanilla patches and content. But if that's the case, you'd be better off playing SVN revision 697 over 0.1.6.