I've rented for West Air and found them to be great. If you aren't going to take the tour then there's little point in landing at IG4 anyway, there's nothing there apart from a gift shop. I took the tour which was sold with and without food (I went without - which was a good thing) and enjoyed a stroll along the rim of the Canyon. The glass bridge is open now I believe.
Ian
PS I know this is stating the obvious, but the weather in the GC can be very very different to Vegas