Yes, I agree with BabaG. I was using drop frame for a long time and I was always having a hard time making sure multiple spots on the same sequence were all exactly the right length. For commercials, it makes it much easier to use ndf, especially when you want each one to start on an exact even minute when you edit to tape. The ndf tapes I have made in this way seem to be fine, and I have never had one rejected by a station.
Have a wonderful day.