I'm going to assume you are referring to the 6 foot Prism Ion
rather than the Macro Ion in this response: I own a Prism Ion
that I bought around a year ago and I think that it is a good
little kite. The quality of the workmanship on the kite is
excellent, plus it comes with a very informative manual.
In terms of flying qualities, I think that it will be more
exciting than your spinoff. It has an easy method of adjusting
the flight characteristics between mild and radical, as well as
a straightforward wind range adjustment (just slide the knot.)
In it's mild setting it is a good trainer, with a large turn
radius, but it does move through the sky quickly. In it's
radical setting it will do tight turns and all of the radical
stunts that you have heard mentioned here. THe axles will
be very easy to perform, the Ion does those real fast, too.
This not a precision kite in either setting, nor
does it have great edge handling abilities. Because of the
cambered leading edge, it will do ground rolls really well,
but tip drags are a little tough (likes to roll over).
Overall I like my Ion but it is not my first choice to fly.
I usually pull it out when I am introducing a beginner to flying
due to it's ability to take the hard knocks (fiberglass l.e.)
I prefer my El Nino when I want to fly a 3/4 size kite. Those are
the + and -. Hope it helps.