I have a sigma rox 9.0 and it really is a nice computer.
Likes
Wireless sensors work great.
Display is awesome. You can see everything at a glance and customize to display what you want.
Battery life is fantastic. Only need to change about every 6mo - yr.
Its very easy to use.
It can be set up for 2 different bikes and logs the miles on each of them.

Dislikes
Logging capabilities don't include cadence. It will tell you min/max and avg cadence, but it isn't logged every 5sec like heart rate, speed, and inclination.
Software is a bit peculiar, but it gets the job done.

If you think you may become obsessed with biking, spend the cash on a refurbed 705. Then when you are thinking of a power meter of some sort, you already have what you need.

I'm thinking of selling my Rox 9.0 so I can purchase a Garmin 705. (Around $360 refurbed with cadence/speed and hrm)

Rick