Considering Perfect Patio came out almost five years ago, I think I've gotten my $10 worth since then regarding the play value of hot tubs.
I don't really care that a new one has been released to the public for free; it was in honor of a 20-year celebration, and you still have to buy Perfect Patio to gain access to the other variations.
I'll enjoy having a new type of hot tub, too. Isn't often that you get new variations of special items once they've already come out.