Margerine--YECH!!!!, actually you'd be better off with Xtra virg olive oil, that you can spray in a mister,and it's a fairly neutral flavour too.
I am very ALLERGIC TO DAIRY and use filo a fair amount... baklava, quiche tartlette, spanikopita, etc, etc. I use margerine both for personal and catering products, as well as my new bakery venture. Always get rave reviews. Most people have no idea because my product is so good. Those who keep kosher and need pareve foods or like me are allergic are thrilled when they find out.
I have tried evoo and not had as good results.. interesting how we each have very different experiences