I tend to use a brickwall because that's how the music was downsampled anyway (if it wasn't it would cause aliasing) so it's recreating what's on the disc and I like that concept. That said I agree that other filters can help a lot with some of the clipping and transients in some recordings, I even made a couple custom filters myself for Foobar back in the day. The closed form filter thing seems really like marketing to me not arguing that it sounds bad or good because again it can.