In several studios I worked with, I laid my hands on Maya since version 2, with my favourite being v7. Since Autodesk went on the helm of the product, things have started to go downhill from there. I've been around in 3D for approximately 19 years and it's the first time I am uncertain as to which direction to follow.
Maya 8.0 was totally unacceptable as a product and it was done in a very short time, throwing everything around, just to have an Autodesk logo on it. Failure.
Things started to be a bit better, stability wise in version 8.5 (and SP 1a), but still, no substantial new functionality. Crashes didn't take long to appear.
Then came 2008, which re-introduced us to the downfall. I've been working on some quite demanding projects, and the 64 bit edition of Maya 2008 just can't handle it when a scene exceeds a certain amount of memory requirements. I remember Maya 7.01, which was 32 bit, used to feel a bit stuffed up if one was trying to work on scenes larger than 1.5 GB in RAM (not file size). Beyond that, it couldn't handle them, because naturally it was running out of permitted 32bit memory.
In Maya 2008 64bit, the problem remains. Once a scene requires more than 1.4gb of RAM, crashes occur like rain and I find myself spending 80% of my time looking for workarounds and 20% for actual work.
At the moment, I do what has to be done, but I am seriously considering a jump. Autodesk killed Maya and that is the hard truth. I'm saying that because I've never seen a mega-powerful 12k euro Linux workstation crash under Maya... but Autodesk did it. Repeatedly.