I have a set of Boyd 58mm carbon tubular rims as well as a set of PSIMET Kinlin 300 alum clinchers w/ WI H2/H3 hubs. So I feel compelled, and qualified, to answer with my opinions/experiences.
Pros: great customer service/response to emails, reasonable turn-around time, good looking carbon rim, price
Cons: hubs are very sub-par, packaging was lazy at best(skewers were loose in box, scuffing up the spokes and rim), skewers were "free" probably because they are complete garbage(hardly worth the effort of walking to the trash can to throw them away!)
Pros: completely custom, amazing hubs!, great packaging, easy communication, I got EXACTLY what I wanted
Cons: wait time (~50 days from payment to delivery), 'supplier shipped wrong color hubs' (delayed the build ~1.5 weeks)
So, if I had to do it all over again, I'd DEFINITELY still order my alum clinchers from PSIMET even with the wait time. They are the best rolling wheels I've ever ridden and I have no doubts they'll last a long time. The build quality, the feel of the wheels and spokes, just everything about them felt superior, and that was confirmed in the ride quality. The Boyd's are plenty stiff, but the hub just doesn't feel like I want it to, and it's not just the RIDICULOUSLY loud freewheel noise, it's just the overall feel while riding.
I really wish I had the patience a year ago when I bought my carbon tubular rims. I went w/ Boyd because they had almost no lead time and because PSIMET was backlogged several weeks. I saved maybe $200-300 going w/ Boyd but I honestly don't feel that the savings were worth it now in hindsight. I plan on replacing the Boyd's w/ some PSIMET carbon tubulars next summer. Not only do I desire better hubs, but it'll be so much better/nicer/easier having 2 wheelsets with identical hubs so that swapping wheelsets won't require a single derailluer adjustment! Currently I'm having to dial in the shifting every single time I swap wheels (for racing vs. training).
In conclusion, don't make an impulse decision, don't decide purely on availability/pricing. Don't settle for anything less than what you want! I'm probably the most impatient person on Earth, so I know how hard that advice is to follow, but even I have learned to not rush purchases like this. When you're spending 6-8 hours a week on your main wheelset, and/or spending $40+/week on races every week, you'll wanna be happy with the equipment you're on.