What are the differences between the e-LCR and the MxR?

The MxR utilizes a Push-In/Push-Out mechanism which allows for easy memory card removal during a shoot.
If you prefer the security of storing a memory card with an adapter, the e-LCR is the solution for you as it features a large surface area for easy labeling and archiving. The memory card may still be removed from inside the adapter at a later time if necessary using a small screwdriver (the SDHC memory card has a little indent at the edge).