Yes it is :) I was worried about it looking a bit OTT but a quick test fit (ie. holding it in place with paint cans lol) seems to look pretty nice to me. Agressive without looking too ricer.
I bought special primer paint and good quality spray paint to get it gloss black, but test sprays on HDPE I have laying around showed that nothing sticks to this stuff. I could scratch off the primer, 3 coats of black and 2 coats of clear with my fingernails :( If you scuff the surface with very fine grit sandpaper the cuts absorb the paint and actually get bigger. It's tough plastic, but definitely not intended to be painted!
I also have some gloss black vinyl wrap, but not enough to cover it myself. A shop I called about wrapping it said they couldn't do it because they need to heat the surface for the wrap to stay put while they work it, and that's a no-no with HDPE as well (melts at 125 degrees C). I could order a large sheet and try myself without heat, but that'll take too long and will result in heaps of wasted wrap.
Final idea is to plasti-dip it. I'm too impatient to wait for an eBay delivery over xmas, so I'll be spending $30 on a can of black, and $30 on a can of glossifier on my way home from work this afternoon.
If all that fails then it'll go on in it's current state, but that means I'll need to 'un-gloss' my rear valance. The whole car needs to be the same the whole way 'round as far as I am concerned!
Edit: I could also just try the glossifier on its own seen as the splitter is black already...