I haven't either, and no reviews on the vast dark reaches of the inter webs isn't a good sign. Brake pad compounds are surprisingly unregulated.
EBC HH is a decent street compound and the general go-to opinion on this board, and will work well for most people. They can collect uneven deposits if not cared for/ bedded in properly. Uneven deposits can feel like a warped brake rotor. If thats the case, clean and re-bed them before you invest in a new rotor. Don't forget to flush your fluid!
IMO: brake pads are not where you want to save a buck.