Mature Metal discussion

Ok, so I know you get a lot of this ‘which one do I choose?’ around here, but I’ve one more for you all. I just need some judgement and perhaps experienced advice on purchasing my first chastity device. I’ve not got much cash handy, being a student and all, and I’m uncircumcised so that narrows my options down some. So far I’ve concluded my options to either a Mature Metal Jailbird, which, if I have long enough, I should be able to get… OR This from Extreme Restraints. It has a ton of good reviews and it isn’t one of the Chinese imitations. The only thing with this one is that I have to cover the hinge, which I don’t mind at all for the price. Plus, I’d be able to get this one right away. In terms of usage, I don’t plan on using it for more than a week or so at a time, during study periods where every second spent ‘jerking around’ is a second wasted. Your advise is much appreciated, arty P.S. Visibility is an issue for me, I’d like it to be as discreet as possible. How discreet is the Mature Metal Jailbird? (About a 3inch ling cage).