They do some things well and others not so much. The main strong point for me is that they offer decent products at very competitive pricing. Cons: a ridiculous email helpdesk. I always have to remind myself they only have about 200 employees
This is it in a nutshell with IK.
Pro's:
They do make products that customers are in demand for.
They price them very affordably.
They mostly deliver what they are supposed to, the results often compare with products much more expensive
Con's:
They rush products for launch that aren't properly tested or ready
They often miss obvious features or design flaws that should have been dealt with prior to release
The upgrade policies are borderline insulting to existing customers
Customer service is some of the worst I've encountered (I have nearly 1000 3rd party plugins on my studio computer and deal with a lot of companies - I'm not saying based on emotion)
Bug fixes are inconsistent and rarely fix everything. I own IK products almost across their entire line and I don't think any of them are truly stable.
I was just going to add too, before I bought ARC 4, I also demo'd DIRAC Live. That software is much more expensive, the HW options are more confusing and the software is much less intuitive to use, which is ultimately why I didn't buy it. But I did speak with their customer service who were prompt and helpful with replies, they actually helped me achieve what I wanted with the software (which required tweaking a config file in text edit) and the results were very good. They also extended my demo (without me having to ask) so I could actually trial it the way I wanted to, and checked in with me to see how I was getting on. They have some features beyond what ARC is capable of and is closer to what Trinnov does (at lower cost). I'm still not sure it would have been a better option than ARC for me but I think they are well worth considering. Its easy to rant on forums when things don't go well, but when people go above and beyond its worth recognition.