4 cents don't include transaction fee, however payments to the service can be slow and don't require inclusion in the first block so they can very very cheap.

Bitcoin transactions in testing have worked perfectly & the display is zero conf which means you can pay and see that the payment on the hash the minute.

Customer uptake has been lacking for my project, but I believe that's because I've created something that works really well for two very niche markets (which fortunately have a lot of overlap.) depending on what your project is, you can always add a credit system whereby people can dump $5 or something via credit card and you allocate that to them for them to spend as and when they need.