I'm doing the tech spec measurements on the Lightweight right now and I really like it. Since I own several of Fred's custom knives, a bunch of his mid-tech patterns, and both old and new-school Spyderco Perrins, I'm picky. Although I love the craftsmanship of the original Street Beat, its price was daunting and the older versions were not sheath friendly. The squared corners of the ricasso at the bottom of the index-finger choil tended to grab the Boltaron and took a lot of breaking in. After I joined Spyderco, I showed them one of my modded Street Beats with a rounded shoulder and they worked that feature into production. Nevertheless, I prefer the Street Beat Lightweight's injection-molded polymer sheath over the Boltaron. It's basically a shortened version of the one I prototyped for the Street Bowie when it was reintroduced a few years ago. In indexes properly on the handle contours at the front of the index-finger choil and provides a very nice snap fit, full handle access on the draw, and absolutely no rattle.
The sheath has eyelets instead of rivets--a consistent Spyderco feature that makes it easy to zip-tie or lash onto packs or other platforms. It comes with a G-Clip that can be attached to either edge and either side of the symmetrical sheath, providing a wide range of carry positions. My personal preference (and Fred's) is to remove the G-Clip and attach a loop of 550 cord to the eyelet at the tip of the sheath. Loop the cord over your belt with a cowhitch and tuck the knife and sheath into appendix carry. When you draw, the sheath and knife come out together, then the tension of the "static cord" pops the sheath off when the knife is safely away from the body. This is also a great method for a support-hand draw, since your other hand can access it and draw to any angle. A support-hand reverse-grip draw for handgun retention is a very happy thing with this style of carry.
The injection-molded handle of the Lightweight faithfully maintains the contours of the original and adds a very subtle EDM texture that's about equivalent to bead blasted Micarta or G-10. This makes it much less slippery than polished Micarta, but not aggressively textured at all. Since the handle ergos are so good, there's really no need for that. For lanyard and fob fans, the Lightweight's handle also includes a lanyard hole.
Like the Street Bowie, the blade coating is black ceramic--probably pretty close to Cerakote. It's durable and doesn't increase cutting friction, so I don't mind it at all. To put the black blade into even better context, I would prefer to see the sheath hardware blackened as well, but it's still a big step in the right direction for operational folks who have a professional aversion to shiny things.
I'm really happy to see the Street Beat in a more affordable, more accessible format. Now I just need to sacrifice a few goats, burn some candles, and spit some rum to sway the gods into making a trainer...