I have a Mason Definition. Had it a couple of weeks. It is lovely. The finish is stunning. At £900 I would say it was excellent value. For that you get a really well made, well designed frame, with a light, matching full carbon fork, headset, and seatpost clamp. The internal cabling works really well, the multiport system is fantastic.
I preordered as soon as Dominic would let me. I based the decision to order purely on appearance and specification. I drew it up in CAD to check size. I was still cacking it a bit waiting for the 2 months. But when it arrived, all that was forgotten.
It arrived on a Friday, first ride was 2 days later, a nice 60 miles, with a climb up Kirkstone pass. It is sublime to ride, stiff but not harsh. Acceleration is addictive, the way it translates every watt of power into forward motion is fantastic. I am really happy with it.
Dominic has done a cracking job with these frames, obviously piling all his extensive experience, and passion into them. The view from the saddle down past the glorious head badge, the way the headtube tapers into the fork, then the gently curving forks, superb.