I only bought the AMS (besides to use on my mom's car) because I would be able to test them against the MSP ones. If I didn't have access to a really nice flowbench, I would've gotten another set of the MSP manifolds. I am by no means rich, but the price doesn't matter to me when it comes to buying parts that are the best (whether it be performance or supporting vendors who are developing new products) for my car and the community.