I posted a review of the 50mm tubulars on here somewhere.
A copy of that is here: http://machine-la.blogspot.com/2011/04/ ... ulars.html
Boyd has been excellent to work with. 38, 50, 58, and 88mm tubulars were purchased. Everyone that bought a set likes them a lot.
I've been able to take them out for a few additional fun rides since the initial review. My initial reactions are still valid. What has become even more apparent is the following:
1) Tubulars rock. Being able to run a lower pressure and not worry about pinching a tube on rough rough pavement is awesome.
2) These things are exceptionally fast downhill. I don't get freaked out too often but on a local descent (one I'm quite familiar with) the Boyds spun up faster than what I'm used to and brought back that "WHOA!" feeling--something I haven't felt since the first time I broke 55mph.
Really, I have no hesitation recommending these hoops . . . especially since you get to interact with the owner/builder of the wheels easily. Read the review you'll see what I mean.