I've seen a lot of customer and review site feedback insisting icue is buggy and plain doesn't work, so I investigated further since the base model (non RGB) K68 is one I'm considering.
Here's the low down, which you really NEED to know because as far as compatibility goes, Corsair only has a list of their OWN products that work with icue. They have no list of what other brands of components that require RGB, OCing, fan speed, or macro software are compatible or incompatible with.
1. Cooling
This is the worst category. Pretty much ALL other brands of Cooling software (fan speed profiles, etc) are not compatible with icue, except for MSI Afterburner.
2. Macro
This is the second worst category. A handful of major brands of KB and Mice's macro software are not compatible, while most obscure brands will likely work.
3. RGB
The 3rd worst category. Here it's mainly the elite boutique brands like Razer that are incompatible.
4. OCing
This is the only category that is not problematic at all, as all other brands of OCing software should be compatible.
Things to keep in mind. Compatible means you can only have it installed. You still need to choose whether to use icue or the other brand's software for that feature. In fact it's best not to even have any custom profiles set in the software you don't use. Incompatible may unfortunately mean you must uninstall the the other brand's Cooling or RBG software, however I'm told a Logitech mouse for instance can be compatible with icue macro software, as long as you use one or the other for macros, not both. In other words the one not used for macros must have NO macro profiles stored.
In summary, if you have any components you have Cooling, Macro, or RGB software installed for, that is likely why your K68 is not working. The primary exception is MSI Afterburner, and mainly because it was designed to work with pretty much ALL brands of components.
Fan Speed, Macro, and especially RGB features are becoming very popular, but unfortunately compatibility of the software that run them is a major hurdle that remains a work in progress.
Lastly, I spoke with two Corsair techs about this today and asked them to relay a message to the design and marketing team's that they need to work harder on compatibility, and let customers know via a vague outline like I exampled above, or better yet a compatibility/incompatibility list for other brands, of what will and won't work with icue. They did however tell me they are constantly working to improve compatibility, and that there's a ways to go on that.