This has nothing to do with looks. When I first got my TJ I put a hard top on it, stock tires, no lift. Hard top had a wiper/washer on rear window. Didn't really like the hardtop, wanted the option of taking the windows out and let the top down so I sold it. The first winter I noticed the only thing I missed was the rear wiper. I drive on dirt roads almost everyday and when they got wet the rear window tends get dirty pretty quick. Not really a big deal since I still have 2 side mirrors to see to change lanes etc. Then I installed my lift and 33" tires, stock fender flares. The first time the road got wet the tires threw the mud onto my door windows, when you can't see out the windows the rear view mirrors are worthless. Lived with it for a while but winter driving after dark it really can be a safety issue. Once I installed bigger fender flares all was well.
So, my only concern really is safety. If your never on mucky dirt roads or rush hour traffic after being on dirt roads its probably not a problem, but even on wet pavement in Colorado it doesn't take long to lose rear visibility and in traffic its a real pain. I'm not sure how the tube fender crowd deals with it, but i'm sure someone will be along to give more useful feedback. Also depends on how much experience he has with the jeep and how young. 16 years old i'd say no way, there's already too many distractions, friends, girls, cell phones, stereo,etc. 18 with a couple years driving responsibly probably much less of a problem. I like the look but as mine is a daily driver and I don't like driving by feel in bad weather and i'm in heavy traffic everyday I kept my stock ones. Maybe the guys running the fenders have a solution to the visibility issue in which case I would make the switch myself.