Is anyone using the VienViewer? If so, are you seeing success with it? Do you notice that you can see veins up to 1cm deep? Also, what do you think of them stating that once you put a catheter through a valve, that valve is forever damaged and will remain open? Our facility has purchased some of these and we are not seeing the success that was advertised and I am unsure how valid the valve info is. Any input would be great!