SOTA vacuum or no?

I am considering a new SOTA Sapphire or Nova as a replacement for my VPI Scoutmaster. I am aware of the differences in features between the Sapphire and Nova, but the biggest difference is obviously the presence of the vacuum clamping system present on the Nova. Is it worth it? The price difference between these two SOTA's is about $1400, I think. I am curious as to the reliability of the vacuum system, sonic benefit versus using the SOTA I-clamp or Reflex clamp alone. Also, how easy is the vacuum system to live with? I'd prefer minimal tweaking, if possible. Thanks!