The $180 Sihoo M56C promises a lot but delivers in spades only for brief sprints. While its clean design and one-size-fits-all approach make it a budget-friendly meeting-room option, the hard armrests and stiff plastic supports make extended sittings discomforting. At least it's a step up from the M56B, right?

Despite its plush memory-foam cushion, the M56C's lack of adjustability and the uncomfortable plastic armrests limit its suitability for day-long sitters. It's a good choice for short bursts of work or quick meetings, but not an ergonomic champion by any means.

The chair's assembly process is as frustrating as its comfort levels are inconsistent. Sihoo could do better, but the M18 remains the better buy. The M56C's one-size-fits-all approach also means it's a one-size-too-small for taller users, making it a questionable choice for everyone else.

While the M56C is a solid budget option for meeting rooms, it falls short for more demanding or longer-term users. Sihoo has made a misstep with this chair, and users should consider alternatives if they need more than a few minutes of comfort.