I'm colorblind (strong deutan) and bought a pair of EnChroma sunglasses after trying out a simpler system that pretty much just used a combination of colored lenses (the lenses would have had to be two different colors and would basically look like 3D glasses).

Allegedly the EnChroma glasses work better the weaker your color deficiency is (i.e. they work worse the worse you already are at telling colors apart). For me there's a pronounced effect but it's mostly through shifting all colors more into violet and yellow.

Using them was the first time green LED traffic lights appeared "saturated" to me although yellow traffic lights appeared a bit darker than normal. A clear blue sky appears vibrant but with a noticeable violet tint. Flowers look neat as reds and purples "pop" in the same way pure blues and yellows do normally. I can tell whether lawns are healthy or dried out.

But they don't "fix" my color vision. Of course not. They can't add color where I'm physically unable to perceive it. They wouldn't allow me to pass most colorblindness tests or operate machinery that requires normal color vision. They can however modulate some parts of the visible spectrum so others stand out more. And they're really good at that.

I've had my EnChroma sunglasses for a few years now and I use them instead of regular sunglasses in most situations (except when I expect they might get damaged). I would probably buy them again. I considered buying regular EnChroma glasses but I've heard the effect isn't as strong and as I'm already not in the group benefiting the most, I worry the effect wouldn't be good enough to justify the price tag. YMMV.

EDIT: I'm fully aware of the dramatic reaction videos that made them popular all over social media for a while. I saw them after I found out about EnChroma and after I had already decided to give them a try but before I was able to do so. If anything, these videos made my experience of first using them more underwhelming. Yes, I could "see" purple in a different way than ever before, but knowing the reaction videos and knowing the person I was with knew them almost triggered a form of imposter syndrome because I simply didn't experience the overwhelming sensation the videos suggested I should perform.

Although I suppose if you need prescription glasses anyway, why not.

Fortunately I don't need short/long corrective lenses, so there's no way I'd wear glasses just for improving colour perception a bit. Even if they were free (I'd try them as a gimmick, sure, I just doubt I'd want to wear them regularly).