i bought one about 10 years ago. i have replaced the pump twice. heating element and cover once. it is due for a new cover. 2 years ago it kicked off in the middle of winter and all the pipes froze and cracked. i replaced all of the pvc last summer. also replaced the sides. they were cedar but were starting to rot. replaced with pre-engineered barn board. expect to use it all the time the first year. have lots of sex in it. i would recommend shooting over the side if i were you though. after the first year you will get bored with it and it will start to fall apart.
my neighbor bought one about 8 years ago and my brother bought a house with one already. both have put more money into them then they'd of liked and basically have had the same experience as you. i can't for the life of me imagine every purchasing one.
it was fun at first. chicks + booze + hottub = naked drunk chicks. then all the chicks grew up and became pregers and ruined it.