Not LSM, all BTrees, but the rest is correct.

Not sure of the current state of Mongo but WT certainly has LSM Trees:

http://www.hpts.ws/papers/2013/WiredTiger-HPTS.pdf

http://source.wiredtiger.com/3.2.1/lsm.html

MongoDB has full ACID support in the Database.

Mongo does not provide durability by default

> can’t compare to Mongo as I have had somewhat limited experience with it

Doesn’t seem to stop most people here.

Amazon doesn’t offer hosted MongoDB service - it’s some other documentDB with sort of compatible API. How can you compare them directly ?

AGPL hasn’t really been tested in court so it’s not clear whether it would be enough to stop someone from running your software as a service.

Isn't that true for most OSS licenses (not being tested in court)?