Doesn't need to be the aftermarket part that breaks

. Even if a Toyota part breaks, they won't give you warranty if you're car is tuned...
The biggest difference is that they lowered the dash in comparison to the seating position. That's something neither a mirror riser or lowered seat can't do. Apart from that, if you live in a country where tuning isn't a big deal, sure. But if you live in (eg.) Belgium, you can forget about any significant tuning. You can tune the ECU, change the exhaust and some minor things on the engine, but anything to give you a big boost will fail MOT.