A six inch random orbital sander is intended for rapidly removing material from large surfaces (eg. table top).  It is not a detail sander and should not be expected to be lightweight and agile.  Use the right tool for the job.  I am very happy with mine.  It does a very good job of quickly sanding large areas.  Unlike the competition (from a certain black/grey company), this sander provides integrated dust collection.  The reason I only gave it 4 stars is two fold.  First, the gear mechanism makes a grinding noise (like it is going to break).  My Dewalt biscuit jointer made a similar noise, but has lasted for years.  Second, the variable speed has a very narrow range of speeds (ie. highest speed is really fast, lowest speed is still really fast).