Welcome to the forum Jeff,
There are several of us that use VB to script our Monarch exports so you will find a lot of help here. I know I did when I started scripting Monarch.
The JetExportSummary method returns a boolean value so try using something like:
expfile =MonarchObj.jetexportsummary ("H:MonarchExports est1.xls", "test", 0).
Try that and you should be good to go.
Once you get a few scripts under your belt, you will find how versatile that tool is and how much time it can save.