That is why I was so excited about the Matte about you - It can be used over any polish, and you can still use a base coat under the original color.
I applied it over OPI "Suzi skis in the pyreness". I find this color amazing. I am a freak of dark polishes, and this is a very very dark grey, with a hint of blue. The first coat was disappointing. It came out very sheer (too sheer) and the brush strokes were notable. The second coat made it look much better, even though it was not 100% opaque. I have no problems with the normal OPI brush.
And then came the "Matte about you". I had no application issues, but I never have problems with ESSIE. Just like with the OPI Matte polishes, also here it dried out very very fast. The look was just as matte (ok, maybe just a bit less, but nothing normal people would notice). The only thing I didn't really like was the fact that you could see the a hint of shiny base coat. Again, nothing that normal people would notice, but who said I am normal?
Saying power - After 2 days the color was still holding nicely. BUT, the matte coat started to disappear at the tip of the nails, so most of the nail was still matte but the tips got the original shiny finish. This is something I can not bare - so I took it off.
All in all I recommend the matte about you, because it allows you to give any nail polish a matte finish. Just don't expect it too last.
A for the OPI color - a very nice color for those who like it dark, but the application is not perfect.