This spa is great for two large people - 4 would be a tight fit.  My husband and I love it.  We've had it set up for about a week now and use it every night.  It is exactly what we expected.  We were trying to decide between a soaking tub in the bathroom or a small spa and decided this spa was a better value and more economical in regard to overall water usage.   It was easy to set up with clear instructions, the cover helps keep the water hot and it is a great way to relax after a challenging yoga class or run with the dogs!