I apologise for not really having an answer to your question, but you are doing what I have considered for some time. What puts me off though is both the price of the kit and the fact that they never seem to suit all formats. Over the years my late parents had all sorts of negative sizes; what point, I think, getting kit that can only handle one or two at most ?
IMO. If you made a positive from the negative you'd not see blur and problems, so unless you are trying to blow up the PC picture more than your would a normal photo, then I don't see why problems should arise. The chemicals in the film will be fairly small and detail should be ok for any reasonable enlargement, as long as the scan had a high enough density of pixels. I appreciate film can deteriorate but I'd have thought you'd see that before scanning were it a cause.
Check the machine spec and see what it claims. Apart from that I hope someone with actual experience can give you an answer since the other thought is that you may have something set incorrectly.