People make too big a deal out of the time limit thing. Tyranid players (pre-zilla) have dealt with it and done fine. You just have to play faster. If you're properly prepped for the tournament, you'll be okay, especially with a 2.5 hour limit.
Yes, I've had people stall on me. You just have to gently remind them ("whew...are we only on turn 3?") and pick up the pace when it's your turn (this has a way of making them play faster too). If the stalling becomes blatent, you might have a call a judge. It'd probably ruin your sportsmanship score, but how would a tool that intentionally stalls grade you anyway?
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