Aruba Gateways (formally called controllers) are pretty straight forward to work with. Setting up is pretty simple, creating clusters, security, etc. works rather well. I've set them up on prem which requires a mobility conductor. Now you set them up using the cloud. There are some quirks here and there, but overall it's a solid backend wireless infrastructure. It's really great to pair these with clearpass for authentication but you can use any other radius.

Enterprise WLAN Controllers with an difficult to configure web gui. But the features are all there you can use this controllers in your environement.