Yes, it's what I currently use, but it has some problems (comment formatting shows up weirdly, the built-in browser uses desktop mode and doesn't let me resize sites so many are illegible, etc). It's the best I've found, though.

Materialistic is nice. The only feature I miss with it would be a custom filter. If I could hide automatically stories based on keywords (like "Facebook"), that would be great.

I use both Relay for Reddit and Materialistic for HN and they're absolutely brilliant. Didn't take me that long to pay for Relay Pro.