Saddle companies will all start out with the same claim nowadays - they all have some sort of technological jargon to use to explain how they tested their saddle to oblivion and made sure that it's the most comfortable and high-performing saddle on the planet. Anatomical, ergonomic, inForm, BodyGeometry, idMatch, etc, etc, etc. This can all get a little overwhelming since it's mostly marketing mayhem, but there is some basis to these nomenclatures and most companies offer a handy way of determining your riding style/posture and which saddle of theirs might be the best fit for you. It's a useful tool to get started.
Bontrager's version of this is the aforementioned "inForm." What does it mean? That doesn't really matter so much as how they differentiate their saddles into different postures from 1-5, 1 being most aggressive (Time Trial and Triathlon, aero stuff) and 5 being most relaxed (recreational, hybrid riding). The Serano slots in at Posture 2, so it's performance oriented for some of the long classics road races where comfort is an important aspect of the race. Just for perspective, the Serano is ridden by Classics rider Fabian Cancellara, and 'Cross-monster Sven Nys.
One of the most notable things about this saddle right off is it's long, sweeping shape, reminiscent of the long-nosed, long-curve saddles of the 80's and 90's. It's certainly a classy and snazzy look, but as a result the rear-end of the saddle feels a lot wider than it really is. I tested a medium (138mm) which usually suits me on most saddles, but the width of the Serano did become troublesome on long rides, so you may want to try out a few different widths before you decide to buy.
Rails are titanium, which keep things comfy and light, but if you're taking the saddle off-road at all you may notice a lot of creaking from where the saddle is bonded to the rails. Most weighted bumps and jolts made a lot of noise, which probably isn't the case with the carbon model.
I don't know that it's appropriate considering my apprehension about rating saddles in general, but the Serano RL can easily grab a 4/5.
For more info, visit trekbikes.com