i have the 4050, it's solid it was for my s10 but my zx650.4 crapped out on me and I have to use the 4050 until my kicker amp is fixed. It's a solid amp and pushes my ID ctx65 comps really well, not as much power as the kicker but its good clean power, def. worth the money. It's also TINY like a dvd case which is awesome for what it offers and it has a little fan under it, I do however dislike that all the tuning is on the underside but it had to go somewhere I just prefer it to be on top or on the sides