Man, do I feel old...I've owned a BUNCH of the items mentioned here, especially the '70's Cfartsman power tools. Got lucky with their table saw though, it has worked for nearly 40 years.
Probably still have the Solidox set buried somewhere in the basement. Having learned that the pellet is probably sodium or potassium chlorate I just might dig it out someday and give it another go with a larger homemade pellet of same compressed with my HF "12 ton" press.
Got the still-unused air chisel from ~ 35 yrs back, I'll have to try it for stripping mortar off salvaged brick/block-TYVM for that idea!
Gotta stick up for the much-maligned Ryobi cordless tools here. The P234 impact driver is absolutely the handiest cordless tool I've ever owned, and I have a bunch of 'em. I have 9/12/14.4v Makitas, old Cfartsmans, HF no-names, old Skil 12v [darn good drill with light battery that runs a long time on 1 charge-probably why they no longer sell 'em] and a couple I can't recall just now. The little impact driver will drive 3" #10 deck screws into Doug fir with no pilot holes all day long, won't chew up the #2 Phillips heads unless I'm REALLY careless about alignment/pressure, and will do at least 200 of 'em on a single charge of the smallest P100 lithium battery.
The little 5" cordless saw is a workhorse also but don't expect the P100 battery to give you more than a few 2x4 crosscuts in rapid succession before the overtemp protection kicks in. The nicad packs [with all their shortcomings like weight/memory/self-discharge, etc] are MUCH better for a heavy sustained draw.
I can reasonably expect to cut 30-60 lineal feet of 1/2" plywood or probably the same number of 2x4's on one charge of a well-maintained nicad. Wouldn't work for a professional framer but for an old DIY guy like me the hassle of keeping a couple of extra batteries in the 6-slot smart charger is not nearly as great as mucking about with extension cords or a generator if I'm building something in the back 40.
The cordless nailer ZRP320 [now replaced by the P854/ZRP854] is also a very handy gadget for installing panelling or T&G cedar siding. Takes awhile to learn how to hold it for consistent strikes which don't require setting the brad heads flush but once again, VERY handy for sites with no power and small jobs for which dragging out the compressor, hose and extension cord is time-consuming.
The P530 rotary tool is my second-favorite Ryobi tool after the impact driver. Great for switch box/outlet cutouts, etc.
Didn't mean to hijack the thread but Ryobi DOES make some good tools now and the universal battery system helps a lot in reducing the number of chargers and batteries needed to keep a fleet of tools running. Yes, the batteries are not wonderful and aren't of pro quality, but they are not priced like a Milwaukee or Bosch, either...just my $0.02...