I don't know that quality equates with feel, but understand the comment. My Shadow has a very different feel to its flippers than other B/W games I do or have owned. Never have been able to figure out why.
Although there have been a few issues with the Stern games I own, each "A" list B/W table has had its own need for attention.
TSPP- ball hangups in the garage, had to widen the space between the ramp protectors;
LOTR- change center ramp post; better orient the center ramp for ring shots; increase balrog switch sensitivity; increase the diameter of the post behind the orthanc tower to deflect all orbit shots; fix the palantir light; install cooling fans for flipper coils;
TZ- rebuild clock boards; tweak carriage on path to powerfield to retain ball without use of magnet; slot machine target reinforcement;
TS- adjust both drop targets for proper operation;
CV- tweak high wire ramp switches for proper operation; tweak top of boom balloon to lie properly with playfield cutout; install additional plastics for protection of skill shot plastic and for first juggler saucer to retain the ball;
WH2O- still cannot get the no way out VUK to fire with greater reliability.
Overall, each game seems to have its design flaws that need to be addressed. For me, that is part of the fun, but a necessary evil. It also depends on how picky you are. I am pretty anal about how my games function.
So, not a big difference to me in terms of reliability, and that is where I think quality lies. Different feel for sure.
I have had no chance to play any of Stern's newer games as there are next to none on route in Northern Virginia unfortunately.