"Probably the most reasonable response is to exercise measured caution for all Wi-Fi networks managed by people you don’t know. When feasible, use a trustworthy VPN on public APs or, better yet, tether a connection from a cell phone.
Wi-Fi has always been a risky proposition, and AirSnitch only expands the potential for malice. Then again, the new capabilities may mean little in the real world, where evil twin attacks accomplish many of the same objectives with much less hassle.
Moore said the attacks possible before client isolation were often as simple as running ettercap or similar tools as soon as a normal Wi-Fi connection was completed. AirSnitch attacks require considerably more work, at least until someone writes an easy-to-use script that automates it."