317288 Magento Product Import/Export

I'm building a Magento store for a client and she requested 'import/export from/to Excel' feature. The problem I have is that each of the products has about 20 custom options and multiple associated images so what I need is a module to allow my client to transfer complete product data between Magento and Excel. The output file has to contain every single product parameter including all images and custom fields references, so she can edit everything directly from Excel and then run the module to update her inventory. Ideally the script will contain some basic error/data-structure checking to avoid DB corruption.