Very nice cage, the motors fit prefect and snug in their housings. I have the 39mm and 40mm cages for my mk3 and both are great.
The cage is very "Daybreak-like" in its design, meaning it fits oversized wheels well and is sturdy. There is plenty of room inside the Mk3 for aftermarket motor leads. The one issue I found was that the cage did not initial seat onto the shell posts all the way, resulting in very bad alignment with the darts and pusher. This was easily rectified by unscrewing the cage and reseating it, starting with the two rear posts to make sure they were all the way down and screwed in, then tightening the front screws. After that, it is rock solid. I have Kepler Wheels installed currently and the cage is perfect for them.