Had mine for 4 weeks and done 12 interval sessions on it and it has massively improved my running and sprinting in a short space of time.
I have also been given some spin class routines to help mix things up as it can get boring.
As previously said, if you only plan to do an hour, by the time you have got all your winter kit, filled up you camel back and got out there, it is time to turn around and clean the bike.