Check out the few threads I have on my Steel Sycip. There is not much difference I can tell between my BMC and Sycip. But what I can tell you is this...There is nothing better than being able to walk into a builders shop, discuss exactly what you want, how you want to ride, what you want it to do, and have a "say" in what the final product will be. Try this with any "big" carbon brand and you'll find there is no chance you'll get what you want.
As much as I love my steel bike this is really just not entirely truthful. Yes the big brands don't do custom. And yes, there is something entirely more satisfactory about getting input into every detail. But this can be done with any material. I can walk out my door and ride over to Gaulzetti and get a custom Al bike. I can go a bit closer and all downhill landing at the doorstep of Firefly for a fully custom steel bike, and I can take a short bike ride over to Parlee and get the exact same service down up in carbon fiber. And I can soft pedal over to Seven on my way and get done up for a custom Ti rig. This is leaving out a multitude of other local builders such as Geekhouse but you get the point.