If it's an IS/POST frame just swap out the calipers for Deore/SLX/XT depending on what you want to spend. They work fine and are loads less ugly than the adaptors.
Yeah, they work fine. You'll likely need new hoses too as the SLX/XT have a banjo fitting at the caliper end, which is part of the hose unless you look at 3rd party hoses.
If it's an IS/POST frame just swap out the calipers for Deore/SLX/XT depending on what you want to spend. They work fine and are loads less ugly than the adaptors.