I'd need to know a lot more about it before the $700 came out of my pocket. The Extra 300 is a nice flying plane in that size model.

Kit? ARF? (It might well be the G.P. ARF - the turtledeck bulkhead has the same tri-legged reenforcement). Servo models? Linkages/connectors used?

Note that I have seen guys turn even nice ARFs into dogs by clobbering through the installations like apes. One image would not be enough for me. I have never bought used without being there in person. But that's just me.