Curiously, James Huang at Cycling Tips just reviewed the Vaast magnesium gravel bike this week.
Vaast is a new American brand built around Allite’s new “Super Magnesium” tubing. Claimed to be stiffer, lighter, more sustainable, and smoother-riding than aluminum — and at similar cost — Vaast is hoping to succeed where Pinarello, Kirk, and others have failed in the past. The A/1 is the brand’s versatile gravel model, and there’s indeed something special to how this thing feels. However, there are also a bunch of places where the company’s relative inexperience shines through, too.
https://cyclingtips.com/2020/11/vaast-a ... -comeback/
It's a fair review (unlike the 'soft' reviews you too often see in bike mags), but basically whatever issues there are with the bike aren't really to do with the material, and there are a lot of pluses.
GCN's Simon Richardson also reviewed the Vaast gravel bike a year or so ago - again a fair, detailed, balanced review. :
[youtube]Gkrp_KYXHow[/youtube]
What seems to have struck both reviewers is how eerily smooth the ride is - according to Huang's review, Allite, the company which has developed the alloy, claims that their 'Super Magnesium' damps vibration '20 times better than aluminum', so I guess that's the key - it's not about stiffness but about vibration damping - and the material itself has evidently also been developed a long way beyond earlier magnesium alloys.
I watched the video a year ago and never thought an awful lot more about it, but I think there's a lot more potential there than I realised at the time.