I have a diablo blade like that on my circular saw and it goes through 2x4s like a hot knife through butter.
Love it.
I recently bought as ryobi air compressor to fill tires and such.
it works, sort of.
If you tried to fill a real tire with it, you'd have a race to see if the battery died before the compressor went up in flames.
It works fine if you have 15 seconds to raise the pressure in a tire a couple PSI but that's all I would ever ask from it.
Any more than that and it'll get really hot.
I know, what do i expect for 20 bux?