Pros
Mercor has grown 1000x since I have joined them in their very early stages as an expert. I have been impressed by their ability to communicate professionally with SPLs being front-line representatives for the awesome team culture. Lots of opportunity to be promoted within project teams as well for strong work.
Cons
Inconsistency of work and team culture - projects can be unpredictable. That is not Mercor's fault as it is fundamentally at the whims of its clients but can lead to an inconsistent experience. I flag this as each person's risk tolerance is unique! Also, not all SPLs are the same and each has their own culture/style of management - I have particularly enjoyed most SPLs I've worked with but keep in mind the variation in humans there and how they manage projects!