I have owned STTNG,IJ,TZ,TAF twice since I started collecting in the late 1990's. I bought them early on and sold them figuring I could buy them back ( well at a much higher price now). I ended up re buying all of them ( sold TAF again unfortunately). Now that I have a lot more time with pins and have owned my share, I can say all of the one's mentioned are great in that they integrate the theme so well into the game. I personally think so does TS, Congo, I500,BSD, and WW2o.
STTNG, might be the hardest to play ( The outlanes are brutal and you can have a lot of clunker shots). It is also at times difficult to maintain, but when tuned in and you can make the left Ramp shot consistently, a great game. The Borg multi ball light show is really good for a game from this era and who doesn't like a ball shot at you from the Borg cannon. Call outs from all the actors are best in the class and it is a game that mere mortals can reach the wizard mode.
I agree it is discounted from the other B/W greats and TS/Congo are catching up in price. I find that funny cause TS/Congo were so difficult to sell a decade ago. That being said, buy it a decent price, enjoy it, and you should be able to get your money back if you so desire. One last thing , if you move one have a friend with you, it is one heavy SOB.