Very, very easy... when it works.
I orered two sets, and I had about 20-25% of the connections fail me, spread evenly across both sets. If every connection would have worked, I would rate it 5 stars because it's just so easy (especially in emergency situations). But considering the price, I'm not happy that several of the connections didn't work:.the central pin in the connector got bent, broke off or just wasn't there, or "reason unknown".
Luckily, things were clear: it works or it doesn't. There's no loose contacts, crackling or buzzing. It's on or it's off. That makes it easy to spot a good or bad connection.
For my next cable works, I'll stick to soldering because I have time to do that. But this is a really good product for an absolute beginner, or for somebody who might need to do urgent repairs on the spot. Just don't count on every connector in the package.