Random orbital sanders are an excellent sanding tool and are
especially great on larger, tougher jobs. The sanders work at a
very high speed and can make quick work of difficult sanding jobs.
However, that high speed can create problems. If you are working
with soft woods, a lighter touch is required as orbital sanders
have a tendency to leave striations. The sander must always be kept
flat to keep from damaging the wood. Take care not to tilt the
sander as it will cut into the wood. If you have a large tough job,
choose a random orbital sander.