Is it sized appropriately for you? Will you ride it regularly? Can you maintain and store it? If the answers to those questions are yes, I'd get it. (Disclosure: I am of the N+1 bikes persuasion, where the number of bikes to have is N+1, N being your current number of bikes.)
Note that this was a woman's specific design, and has a 650c front wheel with a 700c rear wheel. The 650c tires and rims are getting harder to find, but there are still parts out there. If you commute on it regularly, you should carry a spare tube for both wheel sizes. The road bike will certainly be a better choice for a 50km ride, and should speed you up considerably.
Here in FL I don't have the "winter bike" problem, but it makes sense to me. Maybe put studded tires on it, or just keep the knobbies, depending on your road conditions and use.