Honestly they seem kinda useless to me. Today, they blocked a bridge which just fucked a bunch of normal people over. Everyone I talked to who was affected by it just said it pissed them off and they've now got less interest in XR.
Aside from that they're blocking construction of a high speed rail, and failing miserably. Bunch of builders have to deal with them playing their bongos and climbing trees by the construction site. Feels ineffective.
If you have 20 mins, here's Prolekult's "Selling Extinction".
It explains that XR are largely neolib lanyards cosplaying as progressive activists in order to push ideas like 'green new deals' which, spoiler alert, are actually economic plans to retool existing capitalist power structures to future environmental conditions - while not addressing any of the urgent, fundamental needs of the working class.