There's no way to skip commercials or record shows. Sling does offer an interesting alternative: each channel is accompanied by an on-demand section of recent broadcasts, meaning you wouldn't need to record anything because it'd already be available for streaming. Sadly, support for this is inconsistent between channels.

I signed up for Sling TV over the summer to help get me through long sleepless nights with a newborn. It's an interesting service but there are lots of little problems like the above. I dropped it around Thanksgiving.