Tokutek makes a variants of both MySQL and MongoDB using fractal tree indexes. The fractal tree is supposed provide a number of benefits and enhancements to these products which you can read about in detail on their page. They also offer both open source and closed/enterprise versions of these as well.
The single biggest feature that caught my eye with their product was compression for MongoDB. Mongo has been sorely lacking compression and it has been an outstanding item on their list for quite some time that they seem to have little to no interest in fixing. If TokuMX has it, then it's very likely going to be something I start using.
I figured it would quite easy and simple to deploy TokuMX as, by all claims it's just forked MongoDB with a much enhanced storage system. I already have a puppet manifests to deploy MongoDB and handle building up replica's etc... So, should be a snap to try out TokuMX, but it's not. Tokutek doesn't actually offer rpm's or deb's either to download or in a repo, but you can get a pre-compiled tar ball..... yuck. Who deploys and scales this way any more? Maybe I can just checkout their git repo and use the included packager script to bundle me up an rpm for deployment... nope they didn't actually modify this script to work with their fork.
So, advertised benefits aside, there seems to be no quick and easy way to deploy this for testing. Even if the testing proved great, I don't really want to have to maintain a fork of their code so I can bundle rpms. I guess minimally if there was a source tar ball and a spec file that worked, I'd be fine with that, but as it stands now it's the touted benefits aren't worth the extra work to make it simple to deploy and scale.
Tokutek, think of it this way. With the 10gen repo for MongoDB and a few lines of Puppet code I can deploy a dozen servers, with multiple replica sets ready for sharding in an hours time. If I can't do that with TokuMX then puts a pretty high barrier to being worth while to swap out our existing MongoDB.