Just received my unobtanium reinforced e900 propellers in the mail. I've never flown with completely clear propellers before and this concerns me that there may be an issue if I fly too close to trees. The fact that I'm getting 99+ minutes of flight time with only 30 cranks and a t-49 battery makes up for it though. The self healing featuring is amazing. I am also really impressed with the propellers' voice recognition capabilities.