the yak 54 has a short fatter fuse and slightly more wing area.... from my experience they 3d very well, my pilot yak 54 is the best 3der i have flown.... i just wish it was a 100cc
i have a 260 it does decent 3d but it the most precise flying plane i have every flown, other than a pattern plane
the MX2 IMO flys in between the yak54 and the 260
i used to have a WH baby edge 540 i dont know if it is a fair comparison since it was a 1.20 size but it flew the worst of them all... it had a horrible coupleing issue on knife edge
i wouldnt mind owning a bigger 50cc+ Edge 540 but im scared it will have the same bad characteristic ...