Key problem with these things is the availability of compatible replacement pieces, including not just batteries but also tools-minus-batteries. If one part fails you’re stuck with a whole bunch of other stuff that doesn’t work with anything else. For this reason I prefer the Ryobi 1+ system. If I need a new battery they’re easy to find, and if I need a new tool I can buy just the tool without getting a new charger and battery bundled in. Even if one tool fails I still have planty of others I can use the batteries in. My current shop has 4 batteries and 2 chargers, plus a circular saw, drill/driver, recip-saw, chainsaw, light, leaf-blower, garden-trimmer, sander. When my corded router finally dies (soon!) I’ll probably replace it with a Ryobi battery one too.
I guess the one neat feature I see here is the ability to turn the circular saw upside down and build it into a platform for a table saw. That’s kinda cool, but the blade is probably only a 7", so not as good as a regular table saw.
