I myself have updated to the latest iOS 11.4.1 beta version. And it seems to be working fine as a daily driver. Except for a few issues.
Download iOS 11.4.1 Beta 2 iPSW for iPad
Download the latest iOS 11.4.1 ipsw beta 2 files for ipad models, from the links below. And get it free for your iPad .Without UDID or Developer account.
|iPad 9.7-inch (2018)||Download|
|iPad Pro 10.5-inch||Download|
|iPad Pro 12.9 (2nd Gen)||Download|
|iPad Pro 12.9 (1st Gen)||Download|
|iPad Pro 9.7-inch||Download|
|iPad 9.7-inch (2017)||Download|
|iPad Air 2||Download|
|iPad Mini 4||Download|
|iPad Mini 3||Download|
|iPad Mini 2||Download|