Agree on both parts, but the rear gears are very rewarding…when you get them right. The Torque converter is probably the best performance upgrade you can make with an automatic car. Night and day difference.
when everybody wants a car that "sounds cool at idle" and is reluctant to spend <500 on that, it's kinda hard to sell 'em on 2K of converter and gears with a whole: "trust me, it's a game changer" line...