Roomba 690 vs 890: comparison review

Special instructions in the file: https://docs.google.com/document/d/16jwq4fSTMFq3Wi0uJihUzPep-OR5i2rb4MOgxDMjKaw/edit?usp=sharing Please, read it carefully before you start writing. It’s hard for me to guess the word count, so, if you need more words, you can write more.