This is very comfortable and works great for 2 people.  We haven't had anyone else in to speak to how it would be for 4 people.  There is no need for seats as it is comfortable and there is some buoyancy.  The jets are loud but not so loud that you can't converse. This was easy to set up and easy to maintain.  We have learned to not enter without cleaning off lotions as they will clog the filter.  Once we realized this, we haven't had any issues at all.  Highly recommend.