My Cervelo S5 was actually my first road bike! Having gone into my local bike shop to purchase a Cervelo P3 i was talked into learning to ride first before i attempted riding a TT bike! Which was a good thing in hindsight!
The S5 is a super aero bike and ive used it on both long distance Ironman and 70.3 races to great effect.
I now use this as a summer road training bike when i’m not on the P5X and tend to take this away with me when i travel with the boys.
I use Garmin Vector pedals for power and its fitted with Di2, but apart from that its standard.