Pros
Learn hot-of-the-press findings from some exciting new studies from around the world; hone your writing craft in the form of writing scientific commentaries/evaluations and journal recommendations; work from anywhere in the world, from home, coffee shops, or anywhere your heart desires; choose the volume and type of projects that you'd like per week; the managing editors are well friendly, responsive, and are native English speakers (which is not the case for many other editing companies)
Cons
Some of the manuscripts that you will have to edit are not well-done studies, lack novel findings, and/or are poorly written to the point that editing/evaluating can be incredibly cumbersome; you will only get a steady volume of projects once you have established yourself as an excellent editor; it can be difficult to control the precise volume and timing of jobs that you receive per week, which is the nature of the industry; the pay is decent but still fairly modest if you have a Ph.D. and postdoctoral training; this kind of position is not scalable and does not offer much room for advancement, but it is a great option if you no longer want to be in a laboratory focused myopically on one topic and instead want to be exposed to a breadth of research areas