I use this. It works great for the GBPlayer, as like I said an LCD monitor mimics the screensize/shape of a GBA more closely than a "square" TV does. However, if you use yr Cube for Cube games a lot -- then you may not like this thing as much. It does cause "stretch" lines that are noticeable when you play Cube games. I'm planning to do more indepth review on the blog at some point. But if yr using the Cube for GB/GBA games most of the time, this is a great option.