From a partner perspective, their API is pretty good and easy to use, although their support has gotten really bad over the last year. I don't think they have many working on the support team and I have had tickets go weeks without even an acknowledgement. Only after opening multiple tickets or updating the ticket constantly do I get a response.
One thing I did notice though is that they did not seem to be developing or improving much over the last year. Their partner interface can be a little confusing if you need to do more than reporting. About a year ago I was told there were some upgrades coming to the interface and API to make it easier and that they were enabling real-time reporting. Neither of which came about. When I asked again I was told they were working to make their job postings more "mobile friendly", whatever that means exactly.
We initially chose SimplyHired over others because of some of their API functionality (i.e. you can search by O*NET code for jobs) and their revenue share was higher than Indeed. For the last 6-7 months though their revenue share seems to have taken a significant hit and not sure what is happening.
I tried to get some more details from the partner director, but she didn't seem to know who or what was going on with the acquisition. I would have to agree with others that it appears to be a "fire sale" or acqui-hire, as they are not offering their partners any alternatives. In fact the only help I was offered was dumping reports or data so we could go with another partner. Luckily we didn't have clients with jobs posted through their site so we don't have to deal with refunding job postings which could be a nightmare in a short period of time.