I am a MVS guy, seeing this makes me consider getting an AES for shits and giggles, I just wish they were planning on making more than 6 carts. It all boils down to what games they do plan on releasing however.
If they were to release Samurai V Special, you know all kinds of shit will hit the fan.(I have a feeling this will happen)
The one thing to keep in mind is that Retrobit stuff generally is a (very) far cry in quality from original releases, the plastic is usually not as dense, and their circuit boards are very minimalistic making them feel cheap and flimsy. Its possible that this might not be the case with these but its certainly something you need to keep in mind before you are ready to clunk down 2 hundos of your well earned cheddar.