Hotspot security strength?

Hello:

I know this may be a difficult question to answer.

We make it a practice of using the best encryption available.

When setting up a Hotspot we turn off the encryption and rely on the Hotspot code to prevent access to restricted devices. How strong is this mechanism?

We may feel safe exposing the corporate network behind a WPA2 wireless link but do we get anywhere the same strength if we replace the PSK with a voucher?

Tom