SD2SNES is on my wishlist as well, but since apparently the design is open source it can be had much cheaper than purchasing through Krikzz if you look around. If only the NeoSD or the CPS2 Multi was 20% off on Black Friday.
Stone Age Gamer typically has Black Friday sales on their flash carts as well. I'm not sure if they will include the NeoSD or not. Unless I'm mixed up on my dates, won't this be the first Black Friday since it was released?
And yes, SD2SNES is open source, but the quality from other manufacturers can vary. Krikzz is known for supporting his products, but obviously, he only supports the SD2SNES units that he made.
I own the SD2SNES, but I rarely use the extra features that it has over the standard Super Everdrive. In fact, the only feature that I use is the MSU1 support for the unique sound on some SNES games. It's a cool feature, but ultimately, I still prefer the original sound. If I was doing to do it again, I would probably just buy the Super Everdrive and save the money for something else. My only suggestion to anyone looking at the SN2SNES is to make sure they understand what the extra features are and think about whether or not you plan to use them. I certainly knew what I was buying, but I figured I would use those features more often than I really do.