I dunno about the performance... I'm sure it wasn't any less than a regular Genesis + CD + 32X assembly, and since it wasn't stuck together out of three units, it was probably more reliable. I'm pretty sure it was an official Sega product, but it isn't very common. There was also a product licensed by but not manufactured by Sega, called the X'eye, which was like a Genesis with a CD unit built in, but no 32X. Someone with a lot more knowledge on the subject than I have will probably come along shortly and answer your question with more certainty 😉