Ant+ Wahoo Fitness Vs. Digifit

[jeremymc7]

What kind of experience does anyone have with using the Wahoo Fitness (or Digifit) Ant+ with their iPhone / iPad and the PM4?

the ErgBuddy only lists the Wahoo Fitness adapter and Concept2 only sellls the Wahoo Fitness. Shouldn't any Ant+ / Apple Dock adapter work? I ask because 1) I would think it's a standard and either should work; 2)Read some concerns about quality of Wahoo device; 3)Wahoo is twice the price of Digifit devise

Any input or experience with either is appreciated.