Lower end job site saws tend to have non-standard miter slots - often with those annoying little ""nibs"" that block the channels & prevent using a sled.
Highly annoying - way more so than not taking a stacked dado.
They are also real "tippy" because of their light weight. Only attempt cutting a full sheet of plywood at your own risk & under no circumstances try it without someone else around to call 911 or pull the plug on the saw when (not if) it gets away from you mid cut.
My experience was pretty harrowing. The sheet skewed sideways & caused the blade to bind. Sadly, because it was a 15 amp motor, it had enough power to yank itself sideways & start to tip over.
Trying to wrestle an angry saw isn't my idea of fun....
The rotten fence on it made any sort of repeatable accuracy a pure matter of luck.
I paid around $200 for it - sold it for $100 and invested anther few hundred in a Ridgid TS 3660.
I also sprang for a Festool TS55 Eq track saw - mainly for sheet goods, but, it also solves many other issues that otherwise would have you scratching your head wondering how to do it - - and/or asking he for advice (and being told by people a track saw is the best tool for the job).
"Life is what happens to you while you're busy making other plans." - John Lennon