Although it's simple, it really has some great features - like file uploads and exporting results to Excel or XML, forms can be emailed to multiple recipients, and all the main fields you need are there. It looks good and loads fast.
Well done to the developers, I look forward to seeing your success.
I'm sorry you didn't have a good experience with FlexBanner. As clearly stated, the version for J2.5 is currently a beta so it isn't surprising it's a little rough around the edges.
The new version is nearly complete and will be out soon so you may prefer to try that when it is ready.
As far as I'm concerned, the mere fact that this is a free component that works brilliantly for 99% of the people out there who have used it since version 1 is a miracle in itself. It has helped many people earn money online and does NOT deserve a poor review from someone who couldn't even think of a simple solution (like your first problem).
Common sense goes a long way, so does spending time to search for things, or using forums to ask for things, or paying minor amounts for customisations like Chines Language files or compatibility. I'm giving VM a top rating to counter your very unfair low rating.