I had XACD build me a Rohloff touring frame in 2010, going custom was the only option for what I wanted and their price was half that of the cheapest UK steel framebuilder. I paid £425 including delivery, wasn't taxed, though that should have been £120. I enjoyed the process, did a fair bit of research, both on materials and frame geometry, few emails back and forth with their pushy rep Porter (Who may be more than one individual). Frame was exactly as drawn, though I'd failed to notice the chainstay bridge was measured to the centre rather than edge, which restricted maximum tyre size to 35mm when I'd expected 40. Apart from that it lived up to all expectation other than longevity.
Headtube cracked after eight years of almost daily use, repair wasn't viable. Disappointed of course, though I feel I got good value and I enjoyed the experience of designing it. Price had nearly doubled when I enquired about a replacement. I'd have probably gone for that but some non custom options had become available, so back to steel.
Has Ti welding improved? I know there's still tales of woe, but Spa give the impression the failure rate is low and they've been offering them a while. It was apparently the failure rate that put Setavento, as mentioned above, out of business.