Since several people have expressed interest, here are my impressions of DR's new "Marcus", a.k.a., "Fat Beams," after 2 weeks+ of heavy gig/practice use, .045-.125 (5 string set). BTW, the box makes no mention of the term "Fat Beams)." Apppearance; A shocker. These roundcore, stainless steel roundwounds appeared duller, grayer, than the cheaper, month+ old, nickel roundwounds they replaced. They look like they'd been doing the legendary, "I always ate fried chicken before playing," routine was done at the factory. Feel; Tactilely, they feel drier, rougher, than those cheaper roundwounds, but not as extreme as old, unpolished, Rotosounds. As for tension, on the string-through-body, Hipshot bridge, 34" scale, instrument - well, tuned to pitch is what you get. They are a perfect balance between the extremes of floppy and stiff. Just enough give for bends, and to be kind on calloused skin. They aren't tapered, so to max antinodes might require bending them a little behind and in front of the witness point, depending on your bridge. Sound; The hype says, "Fatter, Deeper, Smoother." Well, as for fat, I don't see the $35 investment instantly gaining that for the buyer. Better save up for an Acme. But they are EXTREMELY VERSATILE. They are the answer I've been looking for since I needed a string that could cover the mix of rock/R&B/funk/jazz our band's sets contain. While not as raw, biting, or bright as DR's Hi-Beams (which should come with sunglasses), or Rotosound Swing 66's, they do an great job for rock tunes. With a softer attack, they are full, DEEPER and rich while still being crystal clear and articulate. They go down where DR's Lo-Riders get but not as smooth as flatwounds. However they are SMOOTHER sounding than any other roundwounds I tried, although their feel might lead one to expect otherwise. For slap and finger pops, they have snap, punch, and bounce, in the same league as DR's Hi-Beams. They just do it all for me, even when the percussive, concert grand piano ring that good, out of the box, roundwounds have has mellowed out. FWIW, the descriptions were based on use on a bass with a single coil J pup and alnico humbucker w/coil splitter, neck-through-body, strings-through-body, Hipshot bridge, tilt back headstock design w/alder body wings, maple/koa neck, and quilted maple top. The amps used are a Carvin Cyclops and a Carvin RL1018; various tone setting were used including flat. If you plan of getting a set, be advised, the production of these strings has taken longer than DR expected. So, they have been on back order. If I didn't cover something adequately or something isn't clear, just post.