Avoid
I bought one of these from another shop and I desperately want that money back!) This product is terrible, I experienced nothing but problems with sound and the image quality was poor. It seemed the only "working" game was Flicky which is essentially an 8bit game. This product seems to play 8bit comfortably but the Mega Drive is a 16bit console... and evidently it cant do it. The built in games don't work as they should, changed music, changed soundeffects, very strange framerate in comparison to how the games are meant to play... I tried my old Mega Drive games on it, with similar results. I own a couple of NTSC carts and a large majority of PAL carts and have fiddled around with the switch on the back but with no improvements either way. Avoid this at all costs, there are other options and this one shouldn't even be on the list.

Excellent Console!
Well except for the sound, Otherwise this console is great! I have not encountered any of the issues that many people have had. The games are fun to play and the controls look like a real Sega Genesis 6 Button pad. Everything is comfortable in my hand. I tried two games, NHL 95 and NHL 97. At first I got a black screen in NTSC mode but flipping the switch in the back from NTSC to PAL took care of the issue. If you are running games like Sonic 3 or Ristar or 6 Pak, flipping the switch in the back will get the games to run. Again the only issue was the sound but the console itself is great! I will take this along on hotel trips!

Sound Issues, but good overall
I had a pretty good experience with this thing. All the built in games work great. All of my Genesis games work on this except for my Konami games (Ninja Turtles and Rocket Knight Adventures). The only Mega Drive game I had to try was Daze Before Christmas which works perfectly. That was actually the main reason I bought this since that game does not work on my Genesis. As stated by everyone else here, the sound is the biggest problems. Some games have worse sound than others.

Overall I think this device and it does what I need. But unless you really want those 20 games or need something to play Mega Drive games, it's hard to recommend this.

- Buy it with consideration -
This is indeed a very nice and neat console to obtain and add to your Sega Megadrive/Genesis hardware and gimmicks' collections..

However, I would advise collectors to get a real decent Megadrive here from play-asia or from your used and second-hand store to run you original collections of Sega carts. Believe me, you don't want to risk your carts' backup ram system by utilizing the 'save' feature with this machine…

My only advice is to get it only if you like collecting Sega Megadrive licensed spin-offs, or planning to build an official more compatible 'RedKid' cart library released by 'AtGames'.

Bad sound and low percentage of working carts
I've had a very low success rate when trying out megadrive cartridges, both pal and japanese. They boot up to a certain degree then crash. The sound on the emulated games seems off too. That said, some of them are excellent but why no Sonic 1, 2 or 3?