I don’t think I’d touch a Thumper- they claim to have permission to use the Kona front triangle, directly from Kona. So I asked Kona and they say categorically that they don’t do that, with Switchback or with anyone else. If that’s right, then would you trust them with warranty or anything else?
Course, it could be that Kona just got this wrong and it’s all legit. But balance of probabilities goes the other way really. Especially considering the blustery way Switchback deal with any questions about it- it’s all “a lot of misinformation put out there by uninformed/uneducated people about the process of frame manufacturing.” apparently.
So, yeah. Make up your own mind I suppose. It looks a decent bike otherwise.