You get to control everything. But the biggest single reason would be you can get better flavor building your own. It’s more work but worth it for sure if you're up for the task. Just get some wire, cotton or rayon(I use rayon), pair of flush cut wire snips, mandrels to wrap wire around to make coil, good pair of sharp scissors to cut wicking material, precision screwdriver, and rebuildable atomizer. Good luck to you. Oh and paper towel to clean up juice spills.Not to derail and it may be better to start my own thread but I'm super new to the vaping. I have a Innokin Proton and would like to start rebuilding. From what little I've researched this seems like an interesting rta and may try it. What are some of the main reasons to rebuild your own? I'm pretty sure I can handle the rebuilding but wasn't sure it would even be worth it as opposed to just buying the scion mesh coils.