I think snorkel-use is sort of misunderstood. Unlike hard-core Jeep guys...I bought mine not to do "crazy deep-water river crossings" but, rather to prevent the occasional "dip the RF fender into the goo" problem. Its hard to tell how deep a hole is by looking at flat surface water. Several times I started into what appeared to be a mild mud hole...only to have the entire bottom drop out from under it, half-way through! When this happens, you've got one basic 4WD strategy....FLOOR IT! Hopefully, you will keep the air-intake above the water line and get to the far side of the hole.
This happened to me before I had the snorkel. I made it through but, the motor stumbled and clearly I had submerged the intake tube. It was a massive hole. I held the throttle steady at 1200 rpms for a minute or two, and she cleared-up. Then I shut the motor off, opened the air filter box, and found a couple cups of water, and a soaked air filter. I mopped it up and got on my way...no damage. But it could have been much worse and several guys on the forums have destroyed motors doing this same thing. So the next day I ordered the ARB kit....cheap insurance. That's back when I had the Rancho.
Fast forward three years and thousands of dollars in mods, and I'm now sitting 6"+ over stock. I simply don't have this "fender dunk" issue any more. The biggest issue I have now, is that every time I show up at a trail, I get a bunch of Jeep guys standing around all gape-mouthed...egging me on to do something stupid (like Jeep guys are known to do). The snorkel seems to be a giant "hey watch this" badge, and that's really not what I'm about. Its appearance is so over-the-top, and I wish there was a way to get a higher intake without drawing a crowd.