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Pretty slow here (Middle of England) but it's still doing its job.
I would like to have the ability of adding it to finder (under iDisk) etc.
The new Mac App is pretty stable, also.
 
The latest client seems to be pretty stable (remember the older versions that would just hang after a while...?) even on 10.5.2 so I'm happy so far.
Well, I stopped at RC3 - Mozy tech support basically said that they weren't completely using Leopard finder extensions, and that the application doesn't do a very good job with large registries of data (which my was, approaching 140GB). After waking up in the middle of the night because Mozy had taken up almost 100% of my CPU time and my fans were blowing a hurricane, I gave up.

I might consider them again in the future, maybe in another year or so to let both the application and Leopard stabilize further. But, in the meantime I'm using Time Machine.

I did sign up again for the free Mozy for my laptop, which has less than 1GB of real data and information on it to back up and is running Tiger, and for that amount of backup data on Tiger, it works great.
 
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