I've had one from kuul media for about a week and half,
Very fast, top end box i can compare it with x96air, and i think i can just about remember the
4k firestick, and when people say it's like night and day that is an understatement.
It wasn't cheap i also got a 128g sd card for about £11 there is £5 delivery charge and i did a deal for the fancy remote with air mouse and keyboard £143 altogether.
This box one of the best things i have ever bought.
I struggled to get the remote to work correctly it sort of forgot it's settings, so i emailed them, they replied by email saying we are with a customer at the moment and i will ring you in half an hour, he did and it was fixed in less than 2minutes.
Of course we spent the next half hour chewing the fat and putting the world to rights.
If you are at all interested give them a ring (might have to leave a message) and do it the old fashioned way and just talk, you will find it one of the best companies to deal with Hardy is an enthusiast as well salesman (for all i know he might be the owner) try them you won't be disappointed.