I also had a pretty negative experience with their HR about 1 year ago(it was actually me backing out from the process at a very early stage as they were unable to provide me with answers of what I considered simple concrete questions).
Since then though, I've met some fun & knowledgeable people working there and it doesn't seem like bad company to join.
Thanks for the feedback - if you have any more questions or are thinking of applying, I'm a principal engineer and would be more than happy to chat about life here
And, after first call and initial writeup submission, I haven't heard back from HR after month either way.
Considering such unprofessional handling, I'd recommend against them.