nah! don't you know the best software are the free ones? no bugs at all in the years I've used it.
be sure to download also the plug-ins
and set the resampling to best quality. normally I save for web at 90% quality and excluding the EXIF stuff. 640×480 image comes to about 80-100KB. Try it. If you have like thousands of images you need to resize (make sure to regenerate into another folder) you'd appreciate the batch function.