I have one.
They fit standard stem. Nice and light. If you have a super stiff bike (I have a Scott Plasma Premium) they also have the added benefit of reducing some stiffness to the cockpit. They are not flexy at all, but take away some of the frame stiffness where you don't want to feel it.
Fairly adjustable and a few accessories that make stack adjustable from 1cm - 6cm using risers.
Pad width can be adjusted using the pads themselves or if you need to go super wide they do a 3T pad width adjustment bar (Don't use the Zipp ones, the screws break)
Reach is not that adjustable.
A common upgrade is to ditch the standard pads and arm rests, purchasing the 3T Ventus comfort pads and armrests. Much more comfortable and almost compulsory over long distance as the standard ones are a bit small and firm. The Ventus pads, as they are larger, help reduce reach by a cm or so if required.
I paid way more than you a few years ago :)
https://www.pbandjcoaching.com https://www.thisbigroadtrip.com