Advice needed
 

I am looking to purchase my first 3D aerobatic plane. One of our club members are selling his hanger 9 extra 260 with a dle 55 in. Will this be a good “first buy” ?
would appreciate any advice.
TIA

Well, the 27% Hangar 9 Extra is certainly a capable 3D machine, and correctly powered with that engine. Is it a good "first buy"? No way to tell with so little infos... depends of course on the selling price vs condition, this for the hardware.
As for the software e.g. the pilot, same, not enough infos. Assuming, no disrespect here, that you are getting into 3D, there are plenty of capable foamies to get into that kind of flying and learn. I still learn and perfect new figures on one of those before transferring to the expensive aircraft.
On the other hand you sure could buy that Extra and teach yourself, but then have to keep in mind to fly 3-10 mistakes high, unless your first name is Jase :)

Either way, good luck!

Assuming the plane is in good shape, sure. Go for it. BUT, I would suggest you set it up as a sport plane with pretty conservative surface throws and CG location, then get to know it for a while. Get some time on it. Learn how to trim it perfectly and do that. THEN dial it up a little with a little more throw and move the CG back a bit.

Resist the temptation to just get it running and start jamming the sticks to the corners to see what happens. If you try that, there's a very good chance it's eventually going to end up in an attitude you aren't quick enough to recover from while one mistake too low. That'll be an expensive lesson. Those happen often enough under the bast of conditions. You want to delay that incident as long as possible.....

Very best of luck!