I love my Spektrum DX-7. Of course I have never used the others so I really can't form an accurate opinion. I'm sure they are great and I know all will get the job done.

Still, the model-match feature alone on the DX-7 makes it worthwhile to me. My only complaint (and it is a small one) is that the plastic housing is a little slippery, especially if your hands get a little sweaty or you have any fuel residue on them.