Da, what is the rate of success when you take a trade at open? By open I am assuming you mean as the first one min bar is forming.
I take a trade at open when the set up is in place and the market did not act yesterday but it is acting as per the setup today. As the set up is already in place, it has a good success rate.
You can take a trade on first consolidation and the breakout from that. But sometimes the first breakout will come at higher prices.
If the set up is not in place, I wont buy the first bar as it is risky and the market may sell off on gap up opening.
Smart_trade