Zoho One combines 35+ separate interconnected Zoho apps into one huge value. You get the highest level of each app (called Enterprise) for less than the price of the Enterprise version of CRM alone.
What's great about Zoho is they continue to add more and more functionality while finding ways to bring down the price for their customers. This is a tremendous value - and frankly, one of the best kept secrets - likely because they are a private company and rely on their partner referral network to generate interest.
With Zoho One, you have the ability to not only save hundreds of dollars in software costs - you are able to develop a very clear picture of your prospects, customers, partners because of the tight integration.
The ease of use is incredible as well - it is very intuitive to use.