My first Aquabot lasted 6 years. I now have an Aquabot Bravo - it has a shorter run time, and is supposed to last longer, Only time will tell. I have to say I used my first Aquabot almost every day - I have a whilte pool. It did a great job, and I never vacuumed except after a heavy storm. Are they expensive? Yes, do they do a great job? Yes. Only you can make the decision of it's worth to you.