I've ridden a custom Lynskey gravel bike on both gravel and rough paved roads for the last two years. I put about 5,000 miles a year on it. It's a great bike. Beautiful craftsmanship. Excellent design. I can't call it my "last bike" because I've purchased a carbon road racing bike in the interim, but it IS the bike that I will probably keep for the rest of my life. There's no reason to ever sell it. If Lynskey could make a bike as light as my BMC SLR-01, I would buy it . . . and probably never buy another bike.
Lynskey is excellent to work with. I did have one online rep that was a bad apple (and he's still with the company) but, in general, their sales, design, and engineering people act as if you're the most important customer they've ever worked with. (I'm less than 90 minutes away from the factory, so I picked mine up in person. The head of sales actually helped me load the bike into my car.) Quality people. Quality product.