I've had the 18v since they first came out and have had great luck.
I have all the original tools purchased in 1999+- and just about 3verything else.
Last week I bought two hand drill for a dollar each and often find the Sawzall at 5 bucks.
In the rv I carry their:
12v charger(I won't need it now that I have an inverter)
3gallon wet dry vac
And their very nice tire inflator that you lock the chuck to the valve stem, set your required pressure on the inflator... And walk away. It turns itself off at your preset choice of pressure.
I do not baby the tools and I've only burned out two. An 18v chain saw that lasted about 20 minutes, but the two chainsaws I have now are doing fine, and I think the other was a brand new Sawzall a friend borrowed and smoked out.
Hundreds of hours maybe a thousand, no problems.
My all time favorite is the ryobi devour.
It will, no exaggeration, pick up a foot long 2x4 board, a dust bunny( called a ghost turd by some of you) and a dime and a finishing nail all at the same time(see YouTube vids). It's magic I tellsya!