The Marines have done it for years and do it often so they're good at it but the couple times I tanked off a KC-130 it was sporty.
I was a jarhead. Good might be a bit of a exaggeration, I got to where I tolerated it but never did like tanking off them. They're going as fast as they can go while you're about to fall out of the sky and the controls are real mushy. The old KC-130's they had out of Cherry Point (can't remember what model) had crappy hose reel mechanisms and you'd often get a dead hose. It wasn't uncommon for you to plug and see the sine wave go up the hose, no way to get out in time before the sine wave came back and ripped off the probe. I plugged on the left hose one day and my wingman plugged on the right, I looked over at him just in time to see the wave in his hose and about two seconds later it snapped back taking his probe off and flinging it between his vertical stabs. We were done for the day!
The Brits had an L-1011 they'd converted to a tanker. I used to call it the Battlestar Galactica. It was lit up like a Christmas tree and at night you could see it before you could find it on radar. That thing was a dream to tank from.