Benefits of drinking so much includes a daily "high enema" that just cleans out the pipes, so to speak. After this type of cleansing, I always feel clear... My body feels "empty", and I love that feeling. I normally wait at least an hour before eating anything after such a flush.
Also, I've read that urea is the smallest organic molecule that the body uses for protein building, thus, tissue building. Thus, most of my protein requirements are met through drinking 100% of my urine. The extra gets flushed down.
I too also use it externally. I rub it all over my body, all day long. By the end of the day though, I'm pretty rank... Luckily, I work from home, otherwise, no way I would do it if I had to closely interact with people at a job. I shower nightly and use glycerin soap to clean up. :-)
I rub it on my face day and night, and my skin is improving. I've had some challenges with Acne in the past, but now, I rarely have any, except when my diet includes "bad" stuff, like highly processed sugars and starches. When my diet is very clean, like 100% raw, then I do not have that issue.
By the time my urine has been recycled 2 or 3 times and I haven't eaten anything, it's very clear and nearly tasteless. In fact, when I've eaten raw chocolate nibs (one of the best superfoods on the planet!!!), my pee has the subtle delicious aroma and taste of chocolate! Sometimes, I'll mix in a little agave nectar (a low glycemic sweetener), and omg, it's absolutely delicious! I know that sounds crazy, but it's true! I could live off that stuff! LOL!
Since going 100%, I've only felt better and better. I've lost fat weight, gained muscle mass, increased in strength and flexibility, enhanced my mood, and overall feeling of well-being. But only do 100% if your body is sufficiently "clean", and not toxic. If your body is toxic, you'll end up recycling the toxins, and it could present a challenge for your body to rid itself of it a second time. Most of the time, the toxins will easily pass on through and exit through your primary mode of toxin elimination, your stool. But there might be some circumstances where it gets back into your circulatory system (which your urine is a part of, not a waste by-product) and present health challenges that you could have avoided.
I've kinda rambled on here, but I hope this helps.