About 2 days ago, I received my Retro Entertainment System in the mail. When I turned it on, I was pleased to find out that it did, in fact use an updated NOAC meaning accurate colors and sound. However, if it doesn't play Castlevania III as reported earlier in the thread, then perhaps it is not the chip from the Retro Duo, but in fact the chip from the jeweled FC Twin. Regardless, that makes this the best standalone clone you could buy.
From my experience, the Retro Duo mangles a lot of games badly sound wise, and the colors are ridiculously washed out, along with some vertical bands of light going down the screen. The sound, colors and vertical band issues are close to non-existent on the Retro Entertainment System; There are still a few audio bugs (mostly with DPCM heavy games missing a note every once in a long while(really not that often at all, and seems to be lessened as I play on), and the bands of light are still there, just nowhere near as noticeable as on the Retro Duo). This will probably please fans of Jackal greatly...
Another plus is the pin connectors; on the Retro Entertainment System, they are snug, but I do not need to rip my games out with full force to get them out, and they slide in with relative ease. Much better than on my Retro Duo and GN Twin where I have pulled and even torn some pins trying to get the carts out!
I have a question however, does anybody know if the jeweled FC Twin supports Reproduction Carts such as Earthbound Zero and Super Mario Bros. The Lost Levels? I am thinking about picking them up if it can. I would imagine it so, since the old NOAC used in the GN Twin apparently is able to do so, but I would like to be sure before I spend around $30 on one.
Overall, I am pleased with the Retro Entertainment System, and considering the price, it's a real steal! It has some minor flaws (well, major if you must have CVIII) but if you care about the majority of the games, then this is the next best thing to a real console, and I would definitely recommend it if you have an old NOAC and no working NES. Although, even with the flaws of the Retro Duo, I find this a bit hard to recommend if you have one of those and are happy with it. If you haven't gotten a Retro Duo yet, and don't really care for saving space, already have a SNES, or you don't want a SNES, then this one is definitely the one for you.
With my camera, I have made a couple of comparison images between the 3 main NOACs (Note: These are not the best representations of the colors and picture quality, but do give a good idea as to where each stand visually)
Also, within the next few days, I might make a video review of the Retro Entertainment System, complete with Audio Comparisons.