Welcome to our forum.
I purchased a Hydropool Serenity 5000 back in Sept and have been very pleased with it. What I like is there is ample leg room in the middle and the lounger is deep and perfect for someone up to 6' tall. I am sure you will enjoy it and having a local dealer help you with the setup of the water. Congrats.
Yes 4 people will fit and I paid $7000 with non tax in NB.