I am completely hooked on the Classic Sterns. But I only have a Quicksilver to compare to TNA:
Similar to TNA:
+ Speed (fast)
+ Excellent freaking sound for ripping a lit spinner (very addictive)
+ Upper Lanes
+ Easy to clean and wax (no ramps)
Different than TNA:
+ Bonus countdown, one of the best in pinball.
+ Sweepable drop targets (2 banks).
- No Multiball / ball lock
+ Pop bumper garden with yellow targets surrounding the pops (instead of the TNA slingshot reactor)
- No subwoofer, shaker motor or cool soundtrack.
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Here is a good tutorial. The machine in the video is completely blown out but it still plays OK