Pros
My context: relatively new hire as of this writing. I work with all facets of the business from sales to ops to engineering, etc; lived through startup life before.
Human API is/has:
-Trying to solve a big health data problem that is functionally critical (not "fuzzy")
-Dedicated and solid core of people who are smart and passionate. Strong personalities, but importantly, open minded.
-Market traction: while a complex product, nearly all potential customers take our call, or are reaching out proactively
-(As of this writing) extremely dynamic/important time both in market and team development: every new person and customer makes a difference.
As for other poor/sarcastic reviews, my advice to candidates: come and see for yourself, and ask lots of questions.
Cons
These are more considerations--the company is too small not to determine your own destiny at any level and one man's trash is another's treasure.
No red alarms that aren't typical growing pains at a company of our size--there are never enough resources and getting through this the point of being in a startup. Problems this quarter are strengths two quarters from now, etc.
Those not use to working with larger enterprise customers should expect long sales cycles. Use of health data is very much in its infancy in a lot of respects--prepare for the long game and battling deep entrenchment.
