A while back a demonstration was shown on this forum to crack a BGS/BVG case. It looks dangerous. But frankly, I have cracked out several cards using this method. Some of them ranged in value from $100-$300 in value. This method, scary as it looks, works quite nicely. Here is the link to view the demonstration.
http://www.net54baseball.com/showthr...ight=crack+BVG
Cy