[emerson]

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How obvious would the straight be if the ace comes? If the final board is Q53JA, it's probably pretty unlikely you'll be up against KT. On the other hand, there's a lot more reason to worry if there's four to a striaght, such as with a QJT4A board.

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The ace that makes the straight is more likely to scare away opponents who have paired and are now afraid of the ace.

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This more depends on the style and skill level of your opposition. In general, only poorer players will give you the correct implied odds when you have a weak draw. Most decent players are aware of how vulnerable a hand like JJ is on a TJQK board.

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Thanks. I guess I should have mentioned that I'm mainly talking about limit holdem.