Have been using DR Hi-Beam Medium 6's on my Tobias for about 6 months now. They are fairly expensive, but I find them very even in response from low B to high C, and retain their tune well. They are a bit more flexible than my last set of Hex core strings, but am still able to set them up for a low action without buzz. Generally sound great and feel good (can play for several hours without finger burnout). Will be trying a set of Nickel Low-Riders or Sunbeams when I replace this set - like to try something with a bit more warmth. Best yet!