I have a Nexus card and usually cross with that. My other half lives in Western NY and I live in Toronto. I cross every second weekend in Niagra Falls. The customs officer told me to carry my NOA 1 or 2 once it was issued when I cross as well as current documentation that shows ties to Canada (ie. phone bill, current bank statement and hydro bill). I always get a letter from my employer as well stating when I am coming back to work. This usually does the trick and I have never had a issue crossing. As long as you are honest and DO NOT overstay the days that you said that you are going back home. You will also want to keep track of every visit as you will have to submit this information later on in your application process (Package 3).
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