a top loading Neo Geo CD is a worthy lasting system, the CDZ has had bad cases in which it will stop dead (many reasons why). I perfer the Top Loading CD, sure the load time was a bit longer, but at least the system was more durable. I hope this helps
DO NOT under ANY circumstances buy a front-loading unit. I have one, and they are the most FRAGILE and finicky things EVER. Definitely go for the toploader.