@domo I haven't had much chance to test it yet (I've only just calibrated the angle correctly), but I expect that it'll be a bit of both; I've found laser guides to be very useful on powertools, and it serves a similar purpose here.

If you just need to cut something more-or-less accurately, it's not really going to do anything for you. But if you need perfectly straight cuts, I've found line indicators to be much more accurate than point/arrow indicators, because small inaccuracies get amplified by the end of the line immediately.