IU have been around forever. I can remember them from the 1970's. They have always seemed to collect and repackage existing information, for a significant cost. I remember a "Ruby Laser Handgun" plan for $10 back then that was one page photocopy of a hand drawn original showing a ruby rod, flashlamp, etc. No photos or any supplier info for the rod or tube. No detailed construction, operation, or safety info either. They will not normally be the cheapest reliable supplier for a given item, but they will send you what you buy. Check out LPF's 'buy sell trade" and "group buy" sections. O-like, Rayfoss, even DX are good options. Check out our "reviews" and "companies" sections. People who are new to lasers, teslas, etc., will buy from WL and IU, but once they gain experience in the hobby, move on to better suppliers and better deals.