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Post flop this gift would be fantastic.
But would you fold your JJ everytime you knew someone was holding a bigger pair just ot be on the "safe" side?

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This goes to a point that I don't think anyone has addressed yet. This ability would be exceptionally useful postflop. So you simply try to see absolutely the maximum number of flops possible without committing a significant % of your chips preflop. Limp in late position with 72o every time. Call even moderate raises with any 2. Don't worry at all about being dominated. Then once you see the flop you can steal from others who have missed their hands, which will easily make up for the chip spewing preflop, and get absolutely maximum value whenever you have the best hand. You can do this with very little risk by structuring betting amounts so that you're never committing more than half your stack or so until the river unless your opponent is drawing dead...even if this means folding a better hand early when it's likely that your opponent will put you all in before the river. You'd almost never get checkraised or 3-bet except on pure bluffs, so you'd have tremendous control of pot size.

Of course this becomes less useful as blinds escalate and preflop betting gets significant fractions of your stack in. But by then you should have so many chips that you can gamble a little in good spots.