They have quite an unique hit to them, a softish and a tad muted and that will be the factor between loving them and hating them. I didn't get along too well with the Longasy mediums I tried to get used to. They played weird to me and eventually I went back to milkduds and triangles.
Wether or not you should blow the money to try one is up to you but if I was looking for a good layered tip I would turn my attention to Zan tips rather than Longasy. Tips are a personal preference thing though so what may not suit me may as well work for you so hopefully others chime in aswell to form a wider range of opinions on the tips in question