Hi,
I've fitted the Exotek hubs and found there's a small issue with mine. I found the bearing spacing is out slightly causing the bearing to get pitched together when the wheel is fully tightened so it feels tight. To resolve it I had put shims on the axle where the outer bearing (nearest the wheel) sits, its now nice and free.
Other than this small issue I'd recommend them to anyone as outdoor the standard hubs can get grass caught in them due to the clearance between the hub and inner wheel which is annoying.