i've had it happen a few times where it wasn't good, such as the scam company GENI (halted at 5, opened at like a buck a few months later) where i only had a few hundred on a lark (60 minutes before it was halted in after-hours!), short ARCA right as the NYX news came out (covered pre-mkt next morning when it reopened).
however, there have been a few rinky dinky companies (i was short) that have shot up on pump n dumps , been halted, and usually the company comes out with a "we know of no reason for our stock to be up to the moon" and it craters.
i don't remember which ones they were, because i tend to remember my bad trades more than my good ones.
i'm not a fan of stocks being halted, because as a trader, i want liquidity. when the stock is halted, i'm no longer in any control.