I've never been big on the roller weapons, but for some reason the release of the Octobrush has inspired me. Right now my favorites are the Octobrush, Inkbrush, and Carbon Roller... There's just something about using the Octobrush that had me making cheesy haikus while I ran around the map inking stuff (It looks like a tool from an Ukiyo-e kit, and it's Japanese name is Hokusai, who was a famous Ukiyo-e artists) Haha, I ended up top of my team with 10 splats and 1 death. Of course I'm still quite scrubby with the brushes, and carbon roller, but the whole spamming ZR is no problem since I typically main the L-3.
The range is awful of course, but I think it's fun to try and find creative approaches... these 3 roller weapons have so many hidden techniques, and it's been a blast trying to figure them out. I even get pretty good results in Ranked mode.
I also found that if you double tap in just the right rhythm, while your opponent is to the right, and you're the perfect distance away, you can get a two hit splat. I was practicing that tech all night last night and I'm nearly consistent with it now. It splats SOOOO fast this way, completely throws people off. It's very tricky though, and takes quite a bit of precision... good thing is if they hop (and most people do hop) it almost always does the two hit, occasionally you'll need to do the 3 hit, but if you do it right you'll have them gone in no time.