I've actually had the chance to try this kind of thing. No pressure suit and a max of 3.5-4G's but it holds there (hold a lever forward to control the speed and try to perform "actions" with the other hand). I was able to operate fine the whole run up to the max...but I didn't feel so great afterwards (I have inner ear problems, was quite dizzy). Had the opportunity to actually put on a pressure suit and climb into a jet where they would push 7G's, I didn't go.
There are actually roller coasters that travel/accelerate at 3G's and I know there is at least one in the US that hits near 6G's.
I think this kind of sideways/spinning G load is worse than if it were straight down like normal gravity. I think I could tolerate 2G's all day everyday (might be tiring, but so is mountain climbing with 100+ lbs, you'd get used to it), 3G's would make it hard to carry anything except myself.
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