Advice needed, or wanted so I can ignore your sensible thoughts over my own stupid ones 
Can someone who knows about stuff have a look at the following two specifications of (different) bikes:
https://www.westbrookcycles.co.uk/cannondale-synapse-carbon-disc-ultegra-di2-road-bike-2016-p288001
https://www.specialized.com/gb/gb/bikes/road/roubaix-sl4-expert-disc-udi2/106586
The Roubaix is £7-800 more than the Synapse. Both have Ultegra Di2 and discs.
The Roubaix is the Fact10 carbon whereas the non-Di2 Roubaix is Fact8.
I don't know if F10 is the same kind of thing as Cannondale's HiMod stuff, or is that more like S-works?
Anyway, what makes the Roubaix more expensive, and THAT much more expensive, rather than just the name "Specialized". I thought Cannondales were quite expensive (years ago) and you paid for the name.
I'm going to test the Synapse later this week and at the weekend for an extended test ride/few days. I've been on a 20ish mile ride on a Roubaix (non-Di2) and found it quite comfortable but I was knackered from a previous ride so didn't ride hard/far.
I don't know what to expect of the Synapse. Phrases like "buttery smooth" raise an eyebrow... and the Roubaix was like riding on flumps compared to my CAAD10 on which I can feel every little caterpillar pube I run over.
But what if I like it and fall in love with Di2?

Can someone who knows about stuff have a look at the following two specifications of (different) bikes:
https://www.westbrookcycles.co.uk/cannondale-synapse-carbon-disc-ultegra-di2-road-bike-2016-p288001
https://www.specialized.com/gb/gb/bikes/road/roubaix-sl4-expert-disc-udi2/106586
The Roubaix is £7-800 more than the Synapse. Both have Ultegra Di2 and discs.
The Roubaix is the Fact10 carbon whereas the non-Di2 Roubaix is Fact8.
I don't know if F10 is the same kind of thing as Cannondale's HiMod stuff, or is that more like S-works?
Anyway, what makes the Roubaix more expensive, and THAT much more expensive, rather than just the name "Specialized". I thought Cannondales were quite expensive (years ago) and you paid for the name.
I'm going to test the Synapse later this week and at the weekend for an extended test ride/few days. I've been on a 20ish mile ride on a Roubaix (non-Di2) and found it quite comfortable but I was knackered from a previous ride so didn't ride hard/far.
I don't know what to expect of the Synapse. Phrases like "buttery smooth" raise an eyebrow... and the Roubaix was like riding on flumps compared to my CAAD10 on which I can feel every little caterpillar pube I run over.
But what if I like it and fall in love with Di2?
Do you own a set yourself?



Although they do seem a bit like hens teeth... 