It's certainly got advantages, but it's not for everyone. It's very sensitive to leaks and blockages. I literally check my mainline to see if any of my laterals has developed a leak several times a day. Most of the time it's very quick and there's no problem, but because I'm using 3/16 and a shurflo pump, it's crucial to keep on top of it. One squirrel chew can kill the vacuum for 200 taps. Using 5/16 and a traditional vacuum/releaser setup you can get away with some leaks here and there and still have good vacuum. One thing about running 3/16 without vacuum is that it's much more difficult to find the leaks. You'll get good vacuum if you've got the drop, but unless you have a gauge at the top, you won't know if it's as good as it should be, and if it isn't, it's much tougher to diagnose.