Final touches to my CRM

I’m finally to the point where in adding the final touches to my CRM and polishing up and making sure everything is working how it should be. I would love to have a some users test it out, this would help tremendously in finding bugs and issues by having more eyes on it. The invoicing is the final tab that im working on, after that its just small polishing and touching up. I need to know whats the biggest issue users face in business connections and conversations. I want to be sure my platform is the best & simplest to use, without charging an arm & a leg.