I have a love/hate relationship with STTNG. It's the only machine I have at the moment. Had another trade offer for 2 other pins today.
It can be a BRUTAL game(I'm no pro, and couldn't IMAGINE getting 16 billion!) But when it flows, man does it flow. It's as deep as you make it, rather how well you can play it. The right outlane is a b****. The left is the same, but I set the kickback to easy, and that kinda evens it out. As it is, it is VERY hard to get to The Final Frontier with only 3 balls and no outlane extensions.
When I decided to buy a pin, this was the first one I really wanted to own. My personal Holy Grail. But there are days I am tempted to trade the hell out of it. Then, as soon as I decide to call someone to make a deal, it gives me an awesome game and reminds me why it is truly one of the greatest pinball machines ever made.