As the article says latency is still a problem and it's a huge problem in current open source solutions, some stuff I was testing was easily 5 seconds. I know that can be improved with configuration, but when dealing with libraries of 10 words or so, that's pretty bad.
I feel like anyone who is seriously interested in this space has been scooped up by all the big companies and the open source solutions have really seemed to linger because of it. It's one of the first areas I've seen where open source alternatives are really behind the proprietary solutions. Kind of bummed me out.