I ordered two pair of these, one with the 150 and one with the 200, because 175s were not available. I was planning to send one back, but both turn out to be quite useful, the 200 for one computer and the 150 for another (more distant). They are also handy for indoor use generally, especially in stores and in the library, where you need both near-intermediate (to spot the product) and close vision (to read the price etc). So nice job, especially since they are a lot cheaper than those I saw on another site. Also, thanks for having a security code (below) that is readable. (Oops, cancel that last--it did not work first time.)