The headset is an unusual size: 1 9/16" inches. Adapters are available.
As for Lefty forks being troublesome, we have 4 in our household and they're great. Of my own two bikes, one does 120km a week the other 60km/week. Have been bulletproof.
They do need regular maintenance (eg, bearing resets every 25 hours, which is an easy DIY task), but are no different to any other fork in regard to maintenance levels, and for their travel are the stiffest and lightest forks around. I must admit to taking it for granted... I only really notice how good they are when riding other people's bikes and wondering why I'm so crap at hitting my intended lines.
After an hour or so's riding the brain adapts to the more flexy front end, but getting back on my own bike afterwards always evokes the response "Ah, so it wasn't just me having a bad day after all

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They gobble up the rough stuff and are I find they are just more confidence inspiring in techy terrain.