I purchased this bird a while ago and just got arround to buildingit. Ipu a Saito 1.80 in it with a dubro vibration isolation mount. I had to modify the firewall a bit but not much. I put the battery on the mount behind the canopy and it ballanced very well. I have flown it twice and have found it to be a very good flyer. It does most airobatics @ approx. 1/3 throtol and hovers just above half. Ilands like a dream but I have found that after 2 flights, the control links for the upper ailerons have worn from vibration so I am going to replace them with carbon fiber rod and ball links. So far, I am very pleased with this model. However, if you are not an experianced builder, you will have trouble understanding the instruction manual as it is very vague.