Its easy to sync the two services (S4B) and you can also do text messaging as well if needed. It is better than other SaaS products out there in terms of price point. I have been using this product from last 5 years now but never had any issues with it till date. Yes its free version works good enough so dont worry about that. Just go ahead and use. If you are looking for an all in one solution then unify is what you need. You will be able to integrate both gmail and cisco voice mail system into 1 single platform which would definitely help you work efficiently at office or while travelling. And best part is no extra cost involved for usage.