The problem with those soldering sticks is probably more the tip than anything else. They come with pretty crappy tips. If you can put a quality tip on one that would make it a much more viable tool. There's also the fact that even a 25W pencil is too hot for small PCB components. If you're not quick and accurate the first time components can get damaged pretty easily. I've been soldering electronics most of my life, but didn't start using a temperature controlled iron until a couple decades ago. Though back then it was all through hole which is more tolerant to heat. Even so I did heat stress components a few times soldering with a 25W stick. Since I've been using a temperature controlled iron, I've never damaged a component in soldering even after removing and replacing the same component.