Suunto Favor, wow takes me back!! Obviously you have had yours a while and this shows the reliability of this unit. I am pretty sure the favor has ben discontinued for several years (10+???) but i could be wrong. The Zoop follows the industry wide trend towards making more cinservative units. I think the dimensions are about the same and the Zoop would fit in your console.
In my experience the Zoop is a little unreliable. I have seen several units fail, usually due to depth module failure. The battery connections are also a little weak, meaning a bang in the dive bag tends to reset the unit. Having said that I just bought my 3rd zoop, as it is the best value unit out there. I am a pro diver, doing around 400 dives a year and expect a zoop to last two years. Then i just replace it.