Just wondering if anyone has had their suspension set up professionally on their J15.

I happen to know that a previous J15 owner had his car set up with 1 deg of toe out on the front wheels, and was whondering if what difference this makes to the driving experience and handling.

As a rule of thumb toe out helps turn in at the sacrifice of straight line stability. Toe in helps stability at speed.
You'll find in Honda designed rear trailing arms they toe in during heavy braking to retain stability.

Its a matter of preference but I've ran toe out at the front and toe in at the rear to good effect. If your taking it to a proper set up place they should be able to advise, also do the corner weighting.

+1