Hi I am looking to purchase an F-SWT machine for my practice and am hoping to treat a variety of conditions, I am a physio so mostly M/S conditions, but, I have spent much time in aged care and have an interest in skin conditions. Having looked at the range available in Australia I am tempted by either the Storz or the Elvation Piezoelectric devices. The defocus hand-set for the Storz is an additional$8k+GST. My 1st question is has anyone had experience using either device and if so can they give an appraisal. Secondly, is the defocus handpiece essential. Piezo is interesting but frequently the comment is focus area is too narrow/shallow therefore need U/S guidance. I am interested in photography and there are defocus lenses available in that field they allow the user to shift the depth of field from front to rear of the subject. This led me to think that when using a standard F-SWT (say Storz MP100) does moving the tissue treated beyond the nominal focus point result in a defocus effect. A bag of water is much more cost effective than an $8K handpiece needing a $1.5K service every 10^6 shocks. Opinion appreciated.