[DuePew]

I have, but not at the same time. The way I have interpreted them is that when you feel the 'buzzing' (hi F) vibes you are not synchronized with them, in other words your conscious awareness is just starting to change phase- then when you increase your vibration (for lack of a better term) you begin to synch with them and they appear slower, like a fast vertigo-like strobing. This is the state where you can launch, or after, when they actually stop, because you have already transitioned (or not).
If you were feeling both at the same time I'd interpret this as your conscious awareness not being completely in sync with your energy body, and you were bilocating in place, receiving input from more than one phase or focus or whatever you choose to call it.
ps. The vibrations will vary and even cease as you become more experienced, you do not need them to project, although they are a great signpost to 'know when to try' an exit.
The more you do it the more you will have to train your consciousness to recognize when you're ready regardless of vibes. Hard, I know.

ps. I moved this since it doesn't have anything to do with Kundalini.