Despite having my own CSV importer plugins CSV 2 POST and Easy CSV Importer. I decided to give this a try and make sure there was nothing I was missing in terms of the functions being used.
I didn't used a huge file like most importers can handle and this plugin ended up on white screen. Nothing in the code to make use of really, it is a simple solution.
It is meant to be though. There are plenty other importers that try to tackle some of the fundamental issues when working with data. It's never simple not even for premium plugins or their users :)