I've tried a few devices, thought I'd share some thoughts. Physically, I'm tall, slim, cut, 2" soft and 4.5" hard, 4.5" around. No body hair. First one: CB6000S knockoff. + Useful to test with because it came with rings in various sizes + Light - Square rings are very uncomfortable - Getting it together usually involves pinching - The bulge of the device is obvious - The lock knocks audibly against the plastic - The plastic begins to look dirty quickly - Too much space to squeeze out - The shape doesn't fit my head at all and the cage is too long by at least a half-inch It's a toy that's fun for kink session, not for actual long-term wear. Next one: + Easy to get on + Can bend the rings together to make it shorter and more secure + Light + Good fit - Square-edged ring design hurts - Rubber that covered the hinge in the ring hurts - Head can squeeze out of the front hole if I'm hard - Too easy to cum by rubbing skin poking out the sides - Lock is cheap and rusts Better, and much better fit, but ring design still defeats it for long-term use. Next one: + Much more comfortable ring + Sensory deprivation of the cap in front + Strong and substantial + Relatively low-profile - Cheap lock, also rusts - Hard to get on - Quite heavy - Internal width was too much - Ring size was just a bit too big; had to pad with Instamorph - Front cap is huge, much too big and had some sharp edges - Too much space between cage and ring - Not very secure for me when wet This one is better for long-term comfort, but the weight and excess size spoiled it for me. Next one: I haven't had this for long, but I already like it. + Solid contoured ring is comfortable enough to ignore + Size is just right + No lateral movement or knocking thanks to the two poles + Light + Much simpler lock, just as effective but no weight or noise + No shaft stimulation + Small bulge - Hard to get on; par for the course with a solid ring - Still a relatively open head section If the finish holds up, I think it'll be a winner.
The cage I wear has the same base ring as the last one on your list, with a different, more open cage. Having bought custom devices from three makers, I find this cheap cage the most comfortable I’ve worn. The curved, ergonomic shape and the wide base that spreads the load over more skin area I think are the reasons. There’s loads of different design cages that use this same base ring. It’s a winner in my book.