Cisco 1140 AP versus Aerohive

Hey Experts,

We currently have a couple Cisco 1140 APs in our NYC office.  We have mostly Macbook Pros connecting to them and often see a lot of dropped connection and overall slow network speeds.  We have played with the configurations for hours only to continue to see these problems.   We are located on the bottom floor of a building with residential apartments above us and all around us in other nearby buildings.  Using a wifi network monitor, I can see about 40 - 45 other SSIDs in our airspace.  

After talking to some colleagues and doing some reading, I am considering replacing my Cisco APs with Aerohive or at least doing their trial period.  My question is, have anyone had any experience with Aerohive in a similar situation as I describe above?  Have you been happy with their performance?

Thanks
G