Zoho One - any reviews/experiences using it as an 'everything-replacement' from an IH perspective?

I'm an inveterate architect & tool-optimiser. Given a chance I'll spend hours researching the tools for a task and synthesizing all the anecdotes, reviews and data down into the perfect choice for... an email signup button.

I like the concept of Zoho One as it appears to be a set of 'meh, good enough' tools that make up the bulk of what we need to do as solo-operators, and would take a lot of needless 'tool research' & integration time off the table - CRM, email marketing, social automation etc all take care of.

However this all falls apart if the UX is terrible enough to make you want to use other services, if major features are missing, or if it isn't really designed to be used by a solo-founder and a few occasional contractors.

So does anyone have any experience with just using Zoho One and not bothering to specialise any further with other tools? Was Zoho missing anything major, or did it fall down in any areas when actually in use?