Just be very very careful Have the aircraft looked over very closely. Look for prop damage in the log books, this could mean a bulk strip that may or may not have been carried out. Ensure all AD's have been complied with. Ask the CAA whther ther may be any AD's pending. If the aircraft is an aerobatic aircraft I would not touch it if it was not fitted with a non resetable G meter from new. Assess the maint facility that has been servicing the aircraft. Bad maint= bad airframe. Ensure the aircraft is the right one. I have an RV4 it is absolutely perfect for what I do. Don't buy a Pitts if you want to fly for 500 miles IFR. Sounds pretty simplistic but you'd be surprised how many don't even follow thse basic rules. Good luck.