I have two Neatos a D3 and a D7 (awesome tech imo, perfect for my needs) and they are awesome. One is dead, and the other is almost there... there were no viable, easy, options when the company went "poof ... gone"

.
Now I see replacements that I'm willing to try ... but these might disappear too in the future.
Do they have a shelf-life? I will buy 2 for each if not, and I could even rotate/cycle them to keep 'em happy for a longer time.
Whaddaya think ... thanks!
Can't upload a pic ... wrong format... sorry.