Magnetraction is amazing on ice; all kinds of grip. However, I prefer regular camber in most conditions (ice, hard pack, groomed, etc.) except pow; as good as magnetraction on ice if your edges are sharp. IMO, for an exclusive east coast riding board magnetraction is a must; especially if you ride a reverse camber.
For the record Im old school, learned on a camber board and will always ride camber. Tried reverse camber (with magnetraction) and didn't like the loose feeling under my feet. Tried rocker-camber (with magnetraction) which felt better but still missing that locked in feeling. Recently added camrock to the quiver (with mellow magnetraction) which feels like a great balance for all conditions from ice to pow.