Yes it is definately worth it. I fitted the same one on my supra last week and it has made the car run much smoother and the turbos come on very smooth and controlled (it could just be me ). The sound is not that bad, although mine gets drowned by the noise from the induction kit. There is another accessory for about £ 15.00 and you get two fins which fits to SSQV. The gold makes the sound louder that the stock and the purple less.
I took it out on a hundred mile trip to Leamington Spa touched about 150 mph no problems.
Personally, money well spent.