Here is my review about this engine.

The first time I try to fire up I got problem as the plug was dry. The fuel get sucked but the plug was dry and I did not get any burp. I remove the carb and put it together, then it started. I guess something was stuck inside.
I run the first gallon with 1:30 oil after one painful hour at 2500 rpm as stated in the manual. Then I start to fly with moderate throttle management. I'm now at the end of the third gallon and still run it at 1:32 oil ratio. At the beginning the engine was running pretty hot now it seams to be better.
I'm running a pro-zinger prop 22x 8 at 7400. The power is pretty good and the vibrations are moderate. Something very incredible is that the compression is very low but I guess contribute to the low level of vibration which is a very good thing. By the way how come that the power is so high with so low compression?

I get an issue with the exhaust as the pipe start cracking at the welding without any reason. Bob replace at no cost without any problem. Thanks to him. Is the muffler worth the 35 $?? Hopefully I will not have to change muffler every 3 gallons of gas.

Last week I got a dead stick that finish pretty well knowing that with a GP Christen eagles do not want to do it everyday!! I start questioning the reliability and after checking did not find the reason. I flew twice and the engine was "missing" a lot. Then I decide to stop and figure out that one tab in the ignition battery pack was not connected to the cell anymore. I'm now relief and should be able to fly again (after repair of course).

So far it did "burp" a bit in mid range but I have not leaned the top end so far. Just wait until I got the final mixture of oil after breaking. The low end is very lean so far and the plug color is on the brown side. By the way flying up side down eliminates the burp in the middle range. Should we rotate the carb on our DL50???

I like the way it start when cold and if you stop the engine by shutting off the ignition it start on the first flip later. I do not have a lot to compare too but I think that the power is very similar to my brison 3.2 having less vibration and weigh 1 lbs less. The only cons I have right now is that the exhaust spit out tinniest black stains. It should improve when I will move to 1:45 synthetic oil ratio.

I forgot to mention that I got the last version with the motor stand and larger "ears" and I'm quite please with this engine so far.