Thumbs up for an add-on VV module for the GGTS without sacrificing the original mechanical concept. The reason I don't have a VV mod is if anything goes wrong with it, I just can't stomach having to pay shipping to and fro half way around the world to get it fixed.....and the possible month or more of waiting. (I'm sure many have heard of the Pr*vari's E8 error). Reliability is top priority for me and the GGTS in it's current form is perfect....fix it yourself by taking it apart and so tough that practically nothing can go wrong that a little tinkering can't fix.