Real life experience from me:
SS normal pads compound = dairylea cheese, they lasted about 3 rides in local sand/mud so didn’t last long enough for pad to fall off backing – avoid like a one-eyed fat bird at closing time
SS sintered = about the same as shimano sintered and still going strong – no complaints from me and good vfm
SS headset – fine on commuter and has lasted about 1000miles so far – no reason to think it wouldn’t cope on a mountainbike
Have met the bloke at SITS last year, he seems ok if a bit ginger, can’t really hold that against him as it is an accident of birth (he could wear a hat though), never had to deal with him from a customer service point of view so can’t comment on that front.