Eventually, the SkyView will make an excellent replacement for your VFR GPS. But this won't be for at least 6 months, and probably a bit longer. We wouldn't recommend anyone actually pull a GPS unit until we are actually shipping what they need.
We already show terrain at resolutions higher than anyone. But that's in the base skyview price.
Our first release (next week hopefully) shows airspace, airports, and VOR's. But you cannot get any info about these items, they are images only.
We'll add obstacles hopefully a month or two after that, graphical only.
The next release after that (planned for August) will add the ability to navigate to points via direct-to, and look up info on airports.
After that, we'll add a cursor, the ability to pan the map, and click on any object for info. That will be early next year.
So as you can see, it depends on what you really need from the system as to if it will replace another GPS for your needs.