The lags happened very rarely and most times the phone is snappy. Such things happened to all phones, even my wife's iphone. Still much better than winmo where most things lagged big time.
Though after I switched to using autokiller with aggressive setting, I dun get the lags anymore. My free memory also stay above 100mb all the time without me having to kill any apps manually
Samsung Galaxy Note II LTE N7105
Dopod 838 Pro -> Asus P750 -> HTC Touch Pro -> HTC Touch Pro2 -> Samsung Galaxy S -> Samsung Galaxy SII -> Asus Padfone -> Samsung Galaxy Note II LTE -> ??