Highly jealous of those wheels!!
Been looking at a disc myself, as my current tubs are 10sp and the cervelo is 11sp. Can't decide whether to get tubs again or just stick with clinchers though. Need to make a decision soon. Did you get a good deal on those?
I am a fan of tubs for triathlon in particular. They were from wiggle and to be honest there was no great deal, it was just a case of I'd read up as much as I could online and decided that these would fit the bill. Not ridden them yet, only around the block

What wheels do you currently have? This disc can run 10 or 11 speed which is quite handy. All my bikes are 10 speed.