Getting a PA for chastity, in my opinion, is a must. I got one years ago and have used and made several devices. I have an earlier Lori tube. It is hand made and is very heavy. Security is excellent, and masturbation is useless with it on. I replaced the little barrel locks provided with more secure ones I found on the web.
Good points of my Lori tube: Great security. Very good for overnight, comfortable enough to get a good nights sleep. Bad points: somewhat hard to put on (I have to do it, my wife has a hard time), I need to use a strap around my waist to hold the weight. Limits mobility due to discomfort. OK of one is very sedentary, but for an active person, the weight and bulk would be a problem.
I got mine early in my chastity days, and I do not think I measured properly, Since I tend to shrink, it pulls on the piercing sometimes. This is not an issue with the tube, it is with my measurements. I have not tried any of her later devices.