Had our Blue Diamond for 8 years, this year its no longer working correctly.
But I think we all need to preface "years" with how long our season actually is. Here in CT, *maybe* 4 months of use a year. And when I was using it, *maybe* once or twice a week. So 32 months = 128 weeks, times twice a week...I got 256 uses out of it before it went kaput. Paid about 1K for it, so about $4 per use.
Worth it? Depends on the weather

Ive been vacuuming manually since it died and its not a big deal unless its 90+ out (and guess what its been the last couple weeks?)
Would I buy another one? Maybe....cant really afford another $1K right now (thanks, Covid), so I will manual vac until the end of this season. funny though, my wife complains about how much of a pain it is to manually vac, but in the 19 years we've been here...she has never vacuumed the pool once lol