The Flight:------------ Not for beginners - at least with the 14.8/4s battery! The area I fly at ha a rough surface so I have to get off the ground quickly - well, I gave it a little elevator (wasn't running dual rates - should have for the first flight!), and within 10 feet it took off vertical - and kept going! Fairly easy to fly, but its fast - I could think of better beginner models, but I guess this could work if you dual rates, use a 3s batter pack, and keep it slow. Landing was easy - I had a nice head wind and literally set it down from a slow "hover". Does knife edge very easily, vertical / hover is great, inverted flight is as smooth as upright, stalls are gentle and easy to handle - no nasty tip stalls, which should be expected from this type of plane.Battery---------I used a 14.8v/4s LIPO battery - mine is a little bigger than the 2200mah recommended battery - I used a 3000mah battery - a little heavier. I didn't havre to add any weight to balance - I simply slid the battery pack towards the rear just a little to offset the nose weight. Don't try to use anything bigger than the 3000mah - it BARELY fit (it the battery is too thick, it won't slide in the fuse properly.Other-------A few caveats - thats why I rated only 4 stars.1) The ball joints where the rods connect to the control horns. The manual says they bolt is a 3mm hex and the nut is 4mm. Well, the bolt is not hex - it appears to be a philips head. However, I couldn't find a philips head to fit properly - and I have just about every size imaginable, including smaller hobby sets. I ended up taking a small #1 philips head and filed the tip down - it then fit properly. Once I made this mod, securing the control horns was quite easy. Upon further research, I believe this is actually a "JIS" head screw - looks like a philips, but the entry point is more shallow (which explains why I had to file the screwdriver head down) and why no standard bit would fit. I don't have a "JIS" screwdriver, but filing down the #1 bit worked in the JIS type shallow screw.2) The aileron servos use a simple y-adapter. For some reason, I was getting intermittent "twitching" on one of the aileron servos - everything else was fine. I tried a different receiver, different y-adapter - couldn't clear it up. In the end, I ended up getting rid of the Y-adapter. I connected one server to channel 1 and the other to channel 5 - I used my transmitter and mixed the channels to aileron input (I use a Roadmaster TX16s - OpenTX). This fixed the issue. I am using a FlySky FS-Ia6b receiver - tried two different receivers, had the issue with both. Anyway, once I eliminated the y-adapter and gave each servo its own channel, never had the issue again. I've used these receivers in many other planes paired with the TX16s - so not sure why it only manifested on this plane. It even had the twitching with the TX off - so it wasn't receiving anything one-off from the TX.3) The spinner doesn't fit very well - I had to trim about 1/8" for it to fit properly. It was able to install all the way - it was hitting the backplate prematurely and I couldn't secure the screw in the front. I trimmed it with a sharp pair of scissors - the plastic is soft and flexible enough to use a scissor.Other than that, great plane. Built very well. Super easy assembly - took me less than an hour (other than fighting the "twitching server" issue and making a tool for the control horn / ball joints / JIS head screw.thanks for the prompt delivery , it was here in two or three days, the plsne is incredible, just like the name says , ultimate 3d ,it is just thatFinally, a RC plane that came with metal-gear servos. Well built and fun.really fun plane to fly unless a servo goes bad. then its anyone's guess on how it will look after that flight. Also, don't expect to have any parts under warrantee get to you within a years time. I have been waiting 8 months.I bought this plane "Used" from Amazon and was a little scared when I placed the order, but I knew I could return it if there was any problems. Well I'm Happy to say this plane was perfect out of the box and was never assembled. The box was a little rough and had a decent sized hole in it because Amazon shipped it in just the Retail Box instead of putting that box inside another like Horizon Hobby does. Luckily E-fight/Horizon does a great job of packaging their Planes from the Factory. Oh, By the way, This Plane is " The Ultimate ".I've been flying for two seasons now & consider myself an experienced flyer, but not an expert. This plane is really fun to fly, but you definitely need to have some experience under your belt before doing so. I tuned the plane back a little: SAFE turned on & dual rates set @ 30 & 70 percent, I'm a little uneasy about it. I'm doing better each time I put it in the air.If you do buy one of these, make sure you are going with the BNF version, the new AR637T receiver is already to go out of the box.Great plane to learn 3D maneuvers onGreat flying plane, easy to land keep speed up, motor reverse works great.This is my 1st biplane 3d plane. It is quite different than my other 3d planes. You need to pay attention all the time because it wants to do it's own thing. I am still learning it's habits but I am improving each flight. I think it's capabilities are more than my current abilities but I am enjoying it. No crashes yet.