I've compared all of the pdf combining tools I know about, and this one is the best I've used to date in terms of the quality of the interface and the results. I haven't experienced the ballooning file sizes others report, so perhaps the developer has solved this problem. On my wish-list is the ability to reorder pages, but that's about all I'd add to this useful utility. Highly recommended -- until and if Apple integrates this function into OSX, as they should!