It could well be life-changing, depending on your circumstances and condition.
There are parts of the US where it's a big house and almost enough to retire on, if you're lazy and willing to live cheap. It's definitely a few years of runway, if you've got an idea you want to explore. It's definitely a no-loan college education.
Even if you sustained no dilution, 0.5% of $100M is only $500K. Don't get me wrong, $500K is nice, but by no means is that life-changing money.