I got rid of cable about 3 or 4 years ago now and have really enjoyed not being tied to a contract. The only reason I get these services is for college sports (football and basketball) so I look for services with the full set of ESPN channels and FS1 and FS2. I also consider things like CBS sports and other similar channels as bonuses, but not huge deals.
Over the past few years, I have tried Sling, PS Vue, DTVN, Hulu Live, and Youtube TV. At this point, my favorite is Youtube TV. I've had it for about 4 months now and I can only think of twice that I have had a glitch (both of which lasted about 2 seconds). PS Vue is a great service, but would cost me a few dollars more a month. Sling is a good option if it meets your channel needs. I think hulu live might be the best deal especially if you already have a regular hulu subscription, but I would have periodic trouble with buffering. DTVN was fine, and I got a free Apple TV for prepaying 3 months, but it just wasn't my favorite and the extra channels were not ones I personally wanted.
I have heard some people say they don't save money, but I have saved money every month over what I was paying. Plus, from the middle of April to the first of September, I cancel my subscription to whichever service I have since the sports I want to watch aren't in season. So instead of paying a little more a month for cable for 12 months, I pay a little less each month and only pay for 8 months. Works great for me.