I like that in sytyoe you can easily create different profiles including email marketing campaigns as well as manage all your contacts from one place! The UI could be better but it's still much easier than any other service out there for small businesses (you don't need someone else managing this). We have been using insytoo since we first started our e-commerce business about 3 years ago now so not really anything specific i dislike yet - just keep up at least once every year or two if possible. It has helped us automate many of our processes which means less time spent updating spreadsheets manually instead focusing more energy into what actually matters most; growing our brand by being able to provide great products & services.
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