Generally, it's not a good idea for day trading. I've tested it some for the ES. This instrument typically retraces and backfills a lot, so you're better off entering with a limit order on the retrace.
It's rare that this instrument picks up momentum and don't look back, although it can happen.
For instruments that exhibit more momentum moves, using stop orders to enter may be viable, but you're risking a bad fill.
I think you're better off putting up alerts on your software and then enter using limit orders.
Bottom line: Text it extensively for yourself.