I love this machine, it really is enjoyable to play once you spend some time learning the rules.
It can be tempremental and has broken down more often than my other machines.
It has blown a fuse, i had a top drop target problem and intermittantly during the final frontier, it will power off, then reset five seconds later.
Other problems are again intermittant, occasionally the gun loading mech will miss the gun and shoot the ball over the flippers and there is a minor bug, whereby the machine thinks it has lost a ball, even though it is on the playfield.
In all of the comments that i have read about STTING, the majority complain of it being a high maintenance machine.
So with this in mind, you can expect to have to spend some time, tinkering with it.
I am not trying to put you off, your machine could be A1, just giving you the low down so you can make an informed decision.