hi the mk2 4.9 blade is awsome if you show it respect it will lift and pull like a train in the right wind but dont show respect and you will soon see why its called the widdow maker im 16st and its pulled me @47mph in the buggy (felt like 100)and lifted 25-35ft in the air (shat my self)and landed nicely so go for the mk2, ps only had a short flights with mk4 and mk5 so it would be wrong of me to give advise on them