I found that to be exactly so, which is unusual. It seems to me the Concert and Tenor sizes are usually more expensive than the Sopranos. The Concert usually has more frets and is a bit bigger, and sounds a little bit "fuller" I think than a soprano. I am not sure really how to describe it, because "fuller" sounds automatically better, which it may or may not be. I play Tenor size and my wife plays Soprano...she says my uke sounds way to much like a guitar. Concert size usually falls somewhere in the middle (depending of course on the individual instrument).
Some folks think the longer scale of the concert makes chording easier (I am one of those folks), but it all really boils down to preference I figure. If you like it, keep it- if it seems too small, send it back.