A swivel chair gives you one seat that can face three directions without you having to get up and drag it around. Good for a reading corner that also needs to turn toward the television, good for a desk that doubles as a spot to chat with someone on the couch, good anywhere a single chair has to answer to more than one part of the room.
It is not the chair for a dining table, where the swivel just means someone drifts sideways mid conversation and bumps the person next to them, and it is not the chair for anyone who wants real lumbar support for a full day of work. Most swivel mechanisms give you rotation and sometimes a bit of recline, but they are not built for the kind of back support a proper desk chair needs, so if this is meant to be an eight hour work seat, look elsewhere. It also tends to clash with very formal, matched furniture sets, a swivel chair dropped into a traditional suite of sofa and two armchairs usually reads as the odd one out, the one piece that looks like it wandered in from another room.
Where it sits well is in a more relaxed, mixed room, next to a sofa that is not trying to match it, near a window where turning toward the light actually matters, or paired with a small side table that can travel with it since the chair itself moves but the table never follows. It also does well as the one chair in a room full of straight lines, a round swivel shape next to a rectangular sofa and a square coffee table breaks things up in a way that feels deliberate rather than accidental.
The difference between a good one and a disappointing one is almost always in what you cannot see. Push down on the seat and listen, a cheap base will creak or feel like it is grinding. Spin it slowly and feel for a smooth, even rotation rather than a catch or a wobble partway round. Check where the base meets the frame, a well made chair has a solid metal plate and real bolts, not a thin swivel disc stapled into foam. Press on the arms if it has them, they should not flex. And look at the upholstery where the seat meets the back, a tight, even seam there tells you the rest of the construction was taken just as seriously.
Even the best swivel chair is still just one chair that turns. It will not replace a proper desk chair, and it will not anchor a room the way a solid sofa does.