I had one of the original Opals from the early days (did the kickstarter thing and waited like 2 years for it to arrive). Worked from ~2015 until about six months ago and then bought a 2.0.
The biggest key is to use distilled water. And to clean it routinely. We also user ours daily and I think the continuous use helps with the reliability.
Looks like 3.0 is in the final design phase and they released a video in the past week or so where they are working on a water softener that can be added.
For parties, it makes ice pretty fast so if you want an ice chest full, you could probably spend a day making ice, emptying into chest, making more. All the various machines will tell you how much per hour they will make.
We love our Opal(s).
"The absence of the word accountability is not the same as wanting no accountability" -unknown
"You can never go wrong by staying silent if there is nothing apt to say" -Walter Isaacson