i got the mcx,msr,sr120,mcpx 4503d and i find the mcx very slow great for first heli msr and 120sr are a good buy but msr can feel slow so would just buy the 120 sr instead of msr. mcpx and 4503d are in a different league mcpx nippy little thing that can do anything wouldnt leave home without it lol 450 3d a good first big heli all set up for you for those larger spaces(the other half didnt like it flying around the living room lol) hope this helps