I recently posted the discontinued China Glaze Octa Gone Wild and in the post mentioned that Milani Hi-Res was similar. I decided to do a side by side comparison of the two for you all.
The colors are similar and both have a holo finish, but the particles are smaller in the China Glaze, and the holo is smoother looking. I took a picture outside to see the holo better.
It's quite over-exposed, but you can REALLY see the differences in the holo finish. Plus here Hi-Res seems to be a slightly darker, warmer shade of purple.
For those of you who missed out on Octa Gone Wild, that Hi-Res is a decent alternative. It's not a dupe by any means, but Milani is great quality, and you can get it just about anywhere.
Hope this helps...have a great day!