Spotler CRM

Only pay for the functionality you need. Some other CRM's include marketing, systems management, financials, etc. but if you don't need them don't buy them.
Its a very easy system for users to pick up, comprised of a core architecture:
Customers \ Companies = Accounts
Contacts = the customers name, email, telephone
Tasks = To Do list
Activities = records the history of what you've done with that customer
Opportunties = Won or lost sales records

Then there's the reporting, where anything you put into Really Simple Systems can be interrogated, not just the content of certain restricted fields.

We're looking to do some integration and other CRM platforms easily allow this through API services, such as IFTTT or Zapier, Really Simple Systems only provide an API. You can of course code this into whatever you want, but will require time.

Easy to use and train staff on. Support is excellent

as the company grows it is becoming an expensive CRM, so may not be cost effective for much longer

Really Simple Systems was recommended to me by one of my clients and having used Hubspot and Soffront before I found it really easy and straightforward to use. The layout is intuitive and it doesn't need much explanation to get to grips with the features of the software.

Would be great to have an extra page for the accounts that have bought, so they can leave the pipeline and it just leaves the prospects on the accounts page.