Quoted from Lermods:

Tspp. 4200 shipped is outrageous.

Quoted from bigd1979:

Shadow is much better imo . Its a shame games like shadow , congo and other so so themes weren't better themed bc the layout and toys are much better imo than many so called A list pins. If shadow and Congo were say batman and King Kong they wld be top games bc they are awesome players with unique rules and awesome toys

Quoted from BestShot31:

Currently, the market price for a TS is overpriced compared to what it was selling for a year ago, which was around $2500 for an above average condition example (and 2-3 years ago for just over $2000). It's also not in short supply, per se, as 4,225 units were manufactured, who knows how many still exists.

Quoted from tamoore:

I've owned both. I liked The Shadow OK, but it's not anywhere near the same class as TSPP. TSPP is never leaving my collection until the kids sell it after I die.
And, I'm not really a stop/go player as I prefer flow in my games, but I feel that TSPP gets the pinball experience perfect. It's got 5 flippers, and each flipper has shots that only that flipper can make. It's nothing less than a genius playfield layout, and the rules are well thought out and perfectly executed. I never feel like I'm chopping wood when I play TSPP, because progress can be made so many different ways as everything is stacking and whatever flipper you find the ball on, there is a shot you need to move forward. People harp on the callouts and the music - but if you do, you're not a Simpsons fan as it captures the essence of the TV show expertly.
The Shadow seems to take itself too damned seriously (something I find common with B/W licensed themes from that era), and that upper playfield thing just isn't that fun once you've played it a few times. The modes are common for games of this era, and I don't feel like they offer much replayability once you've been through them a number of times, much like JM, DM and similar games.
It does have some cool flow, and choosing the return path of the ramps via the diverters is cool for comboing the ramps - but that is its only great feature. Everything else is pretty bland.
I'd like to present this as subjective opinion, but I can't. It's objective fact.