If you intend running the supply at more than 1.5A continuous, you will need to increase the size of the heatsink. This can be done using the same schematic and parts count by arranging the parts on the PCB differently as in the attached photo.
The PCB on the right was a much earlier home brew JLH PCB. Commercial PSU designs rated for up to 2.5A or 3A often don't have adequate heatsinking for running at higher currents constantly, although they can handle peak currents O.K.
A little bit more than the parts of a DIY project, but considering the work and possible re-work, pretty cost effective.