Hi Amy,
The MyGaze does not have the software functionality of the PC EyeGo. In fact, it comes with nothing. But it does allow for desktop access to anything via dwell. I'm fairly sure that dwell selection is the only clicking method, no blink or switch. You download the EyeMouse Play software from the mygaze website and you are good to go. Although it does not do everything, such as offer on-screen keyboard, or scrolling, it does offer single click, double click and click/hold. There is no right click. There is a pause feature that can be accessible from any screen via the Access Button. Once you have set the mouse function, there is no need to set it again unless you want a different function. So it's more like the Tobii mouse emulation rather than gaze selection. I don't recall that it had a zoom function, but when I tried it on the internet, I did not need one.
I found that it works well with individuals who do not maintain upright head position, which can be key for the ALS population. I actually used it with one of my profoundly impaired TBI patients who has disconjugate eye gaze and has not been able to focus her eyes on objects/pictures for enough time to determine if she's really looking at them.
I found the interface incredibly easy to use, but I wish it had come with some software for trials. However, for the ALS population, this is not such a problem as it interfaces with any Windows program or application (Windows 7 or 8). So the standard Windows on-screen keyboard is accessible, or any other one you'd care to download. What I really loved about it was the ability to stick in on any of my laptop or desktop computers and access MY stuff, no need to transport files or get used to a different desktop or organization. It works with any device running Windows 7 or 8 (PC, laptop, tablet like Surface). I did not get a chance to try it with a tablet as I did not have one available.
I'd say it's a good option for someone who wants access to their computer but is not needing to do extremely sophisticated things (such as right clicking). Not sure how it would work with someone trying to hit very small targets without a zoom. The fact that I did not have problems is not necessarily reflective of someone else's experience - I tend to get really great calibrations on most eye tracking devices. It could also be a relatively inexpensive way for someone who uses their computer for leisure games such as solitaire to continue to do so. There is no question that it was the easiest eye tracking device to set up and begin using that I've ever worked with. And sometimes, the fact that it doesn't do everything means there are fewer breakdowns and glitches.