Edit People seem to be comparing it positively to Zenefits. From what I can tell, Zenefits raised >$500mm and has $60mm annual recurring revenue (ARR)[1]. They also recently fired 250 people, which is 17% of their workforce. This means that they have around 1500 people working there. If each person conservatively costs $100k/year, their staff costs are $150mm/year so they have a way to go before they're profitable. Then of course there's the ethical issues[2].
I don't mean to imply that there's anything wrong with CharlieHR and I wish them all the success in the world. I hope the product works and that in a few years, I'll be able to use the service of a business that is likely to continue operating.
[1] http://uk.businessinsider.com/zenefits-missed-sales-projecti... [2] http://www.nytimes.com/2016/02/18/technology/zenefits-scanda...