I'm better at rolling cones than I am at straight Js. I rolled a pretty nice spliff myself yesterday.
I can roll great joints and decent blunts, but I can only roll cones when I'm really stoned or completely sober.
I only ever smoke spliffs and I always skin up with tobacco mixed in. Well actually, sometimes I use my shisha but it's more of a hassle and spliffs are just way more convenient. Yay for spliffs. Here's a tip.. instead of using standard size skins, get some rips (hemp rips are the best) and then you can roll a spliff whatever size you want. It's awesome. The longest I've rolled was about 50cm long. Glorious.