Let it be a large integer and A be a subset of [n] = {1, ... , n}. The set S-A is the collection of the subset sums of A. In this note, we discuss new results (and proofs) on few well-known problems concerning SA. In particular, we improve an estimate of Alon and Erdos concerning monochromatic representations. (C) 2006 Elsevier Inc. All rights reserved.