My wife has been riding my old Peugeot P6 and we decided it was time to upgrade. At the bike shop, while she was test riding a few bikes, I was admiring both a Cervelo R3 and an RS. Talking about the difference in riding between the two, the salesperson said, "You just need to test ride both and see for yourself". Well, unfortunately, they did not have an R3 in my size and my wife had just decided on the Trek FX 7.5 menís addition (+1). As luck would have it, her frame size is the same as mine, so with a little seat adjustment, guess who can also use it!
Two days later, the shop emails me that they have an R3 that just came in and would I like to stop by and take it and the RS for a spin. Well, who can pass up an opportunity like that, surely not me. A couple of days later, I go back and test ride both bikes and fall in love with both. The R3 is a rocket with great stability and surprising comfort, while the RS is a little more forgiving with the more up right positioning. As I do not race and enjoy long rides (with a little go-fast thrown in), the RS seems perfect.
Now the question, does N + 1 = +1? It is a tough decision!