"To see this stuff" means to observe or witness something that is being referred to, usually something of interest or significance.
Sentences with «to see this stuff»
I've been counting down the days until I will see your stuff in person! (missmustardseed.com)
We haven't seen stuff like this in an action movie in years, or maybe ever. (thescorecardreview.com)
There's no way to really see this stuff at work, and I couldn't really judge how much these features are contributing to the overall performance of the phone. (androidcentral.com)