Sorry, wasn't clear with the comments, in a hurry for McDonald's breakfast
I've done plenty of verticals, thank you very much
It's the only way to get into some clearings and not much other choice with a longline on. Also an essential tool when flying 11 kv lines, which is why I used to teach them. To this day, I would rather do a vertical from the top of the curve on a jettie* than mess about trying to gain speed etc. You'll be too late with the surprise factor anyway.
*high inertia blades and built like a brick outhouse. Don't try it at home on anything else.