I choose 500apps because of their value and incredible superior customer service. They really care about small-to-medium sized organizations like ours, whether you're very CRM experienced or lightly so. Very pleased!
I love 500apps. It's a perfect solution for startups. The price is right and the system does all I need it to. They also have an excellent customer support team.
500apps is a pretty compressive system for a good price. Plenty of integrations. Sales, marketing and help desk automation. I love that it integrates with IMAP!