I have fitted various chastity devices on many men over the past 10 yrs, so here sre my ratings. Others may have different oppinions. CB-2000 I like it and sad it it being phased out. I have bought 2 recently. Well built, rugged. Not harder to fit then any other device. I like the bars for the cage. It is a penis prison. Easiest of all plastic devices to clean. Because of it's larger size, other devices are better to wear under clothes. I use this device first to initiate my slaves to chastity, then I replace it. CB-3000 Slimmer smooth cage design makes it easy to wear under clothes over time. Not any easier to fit than CB-2000. Pins are very weak. Keep extra on hand. Inside of smooth cage hard to clean urine without removal. I don't use this model any more. The CURVE Essentially same as CB-3000. Advertised fot the longer penis, it seems better suited in porn pics to impress, rather than any actual improved value. Not worth the extra price. I don't use it. CB-6000 I like and use this model as my standard chastising device. Rugged, well built. Pins are same as in CB-3000 therefore weak. Easy fit. Cage design prevents erections and imprisons penis very well. Somewhat slow delivery. Worth it. Note:. 1. All smooth cages need to removed and cleaned well, if not the urine will discolor cage, corode it and worse SMELL!! 2. It is very hard to add on any bondage accessories, such as ringlets to plastic devices. . The Penis Prison Been around a long time. When well fitted, very had to remove by wearer. Good chastity effect on sub. Lockable. Bondage accessories can be added. An good choice for short term supervised use and light bondage play. The BRIG Superb. As a Mistress you make the statement..I not only control you cock, I OWN YOU!! Made from stainless steel, heavy rugged, designed to punish as well chastity. Easy to fit. Stong pins. Lockable. Lose key, impossible to remove. Bondage accessories easily added. For short term, medium to heavy duty bondage use. I use it over a three day period during my slave clamping ceremony. Slave knows who owns him. Want a lot, cost a lot! So there you go.