I'd been using Meguire's Endurance Tire Shine for quite a while. I decided to switch things up a bit and give Autoglym Instant Tyre Dressing a try.
Well, I'm now a big fan of it!

It goes on runny, but wipes smooth. And it leaves a nice matte, dark finish.
I've been applying it once, letting dry, then applying again.
It lasts a decent while too for a spray-on dressing.