I was talking with them about something else yesterday and I asked about props they had them for 39.99 a set but I told them I bought some at 29.99 with free shipping. So they sold them to me. Cheaper than the ones I bought from crutch field. And shipped for free .They sent me pics of yuneec original packages like I reserved from crutch field . I'm little weiry of some sellers but these guy s delivered on the 920 plus in 3 days and when I told them that might st16 had been left on after they tested before shipping they sent me a replacement battery.so I bought 2 sets from crutch field And 4 sets from them