I never tried it, since its extremly risky. You cant use limit orders due to the possibility that only one side matches, leaving you with an open position through a high volatility period. If you use market-orders, you can get slippage way past 15 pips through news events. The risk far exceeds the potential gain in my view.
Maybe its potential with automation along with a server proximity alternative, but the costs involved with growing and maintaining such a solution are important, and possibly also high given that the available size during the duration of spreads.
As a rule of thumb, egies that involves arbitrage-like trading is a must for retail traders, since there'll always be someone with quicker market-access and reduced trading-costs compared to a retail trader with customer grade internet-connections,who does so, IF its worth it, particularly if it is this apparent arb like your example.