I don’t think you can really make a call on that yet tbh. The newer designs haven’t really been around for long enough to do enough miles.
I cracked a Lynskey-made Ragley Ti downtube behind the headtube, but that was after a lot of riding over two years, like being ridden up to five or six times a week. I’m pretty sure Ed Oxley’s went in the same place, but again, that would have had a lot of use. I know of someone else who cracked the seat-tube on a Ragley, went back for warranty, came back with a 27.2mm insert bonded into a new seat-tube, but was then sent back and bored back out to the original 31.6mm. Which seems odd.
The good thing about Lynskey is the lifetime warranty. I got mine fixed after a certain amount of confusion and dissatisfaction over the original repair, so even if it does crack, you should get it sorted. And logically, the curved down tubes – more support for the headtube, straight downtube on the Ragley left a lot of headtube showing below the weld – and sleeved seat tubes make sense.
I’m not sure I’d buy one used and therefore without a warranty, but with a new one, you should be able to get it repaired under warranty if it does go and despite the initial hiccup, I’m really happy with the end result. And I suspect that having a Lynskey-branded rather than a Lynskey-made, non-Lynkey branded frame, would simplify the warranty process too.
I’m not sure that’s much help. I guess what I’m saying is that ultimately the warranty back-up is good if the worst does happen so there’s a safety net, Lynskey are good guys based on my experience of dealing with them and their frames ride beautifully – I have a Planet X Ti Pro Road as well.
You’d probably get a more representative response on mtbr.com simply because there are more Lynskey owners on that side of the pond, but I’m not sure the latest designs will have done enough miles for any general issues to be apparent yet and people with a negative experience tend to be more prominent than happy customers as with any online reviews.
Sorry for the long-windedness… 😉