Hi Marcello,
I looked at the FEJ L-39 and asked around on RCU to get some feed back on their L-39's. Then I contacted Mike at Global Jet Club and found that he puts in extra reinforcement in the high stress areas, in the fuse turbine area, in the landing gear mounts ect...... and the price was close to the same. The FEJ from what I was told was on the heavy side for the size, 1/7 scale, thus a higher wing loading. The GJC L-39 is the 1/6 size which is a little bigger and the weight was the same, 21.5lbs-22lbs wet. The gear was another weak area. This was a couple of month's ago so I don't know what has been done to correct these areas since. I am very pleased with the FB L-39 and GJC. Mike has been very helpful when I needed any info. The jet in my opinion is awesome. It's a sleek jet and quick on it's toes. It looks awesome in the air. I would not hesitate to purchase another jet from Mike in the future. Here's a couple more pics of the landing lights on the tip of the tanks and the nose strut. Sorry about the clarity. Cell phone cam.