Input and Output Impedances of Single to Differential mode converter
It depends on what you're driving the circuit with.  Your noninverting arm has infinite input impedance, and your inverting arm has relatively small input impedance.  This could be problematic, but not in every situation.  For example, if your input is some sort of piezo-device, you will be very unhappy.

The input impedance of the inverting input is \$330R \parallel 660R\$.  The output impedances are small, approximately \$33R\$ on each branch.