I bought a set of the answer spring cups and felt they had a terrible fit. They fit very loosely on the shock end and don't lock on like the stock ones. They felt like they would fall off very easily. I decided I would rather take the chance of a spring popping off of the retainer(happens sometimes with losi) than having the whole retainer fall off during a race. I haven't even used the answer retainers because they felt so crappy when installed. I'm not sure if I got a bad set or something, but they were VERY loose. I would say FAR from the best hop up. Just my 2 cents.
