I'm leaning heavily towards getting the Helix myself. All the logs I've seen posted by people on this board suggest it has superior CAT (charge air temps) control. AMS is a close second.
'07 335i E90 - PTF ProTUNED by Dzenno - COBB FMIC - AFE DCI - AA DPs - HFS4 Meth
'09 M3 - Stock