I'm using MC and Liquid. For the quick projects to do, Liquid offers all I need and still in a very good quality (HD).
I'm using MC for the projects that need a deep editing in the clips for stablization, colour, certain effects, tracking etc. That is, if the project is not under time-pressure. MC is very detailed, less intuitive as Liquid is and therefor, it takes a long time to produce the best it can give.
MC consumes far more space than Liquid for projects, media and effects.I very often "loose" control of the files and, what is really annoying, is the need for third party software (like AvidDVD, Squeeze) that is not included in the MC module. That brings for me always the so hated video mixdown in my project. I mean, if I can determine what goes in the QT mov file, why is MC not capable of doing this in the process for a QT mov file?
And then, I still run my good old ACER system under XP. Both, Liquid and MC, run OK. Not fast, but so don't I.
Liquid is the EOL (End of Line). The problem will be that there is a wide range of new camera's coming up. I think that the fileformats and firewire connections will cause more trouble. And there is a point where Liquid cannot be used for the new recordings. I hope, MC will.