as of early 2007, the DVX100a isn't the first in line of great prosumer cameras. It's place there has been usurped by the upgraded HD version, the panasonic hvx200 (or something like that). But, I've worked with this camera on many high-end productions and the results are truly remarkable and beautiful. the optics are excellent, the control over shutter and iris and everything else is top notch. This is an A list camera and the prices are falling because it's not considered "the best" right now. So, it's really a gem of a camera that will have a place in production for a while to come. Of course the draw back is no HD, which will become an increasingly significant drawback for professionals. but for me, who makes indy docs, it's fantastic.
I'm giving it an excellent rating overall as the picture quality is exceptional and it has a host of features, but after owning two of them and renting another, plus what I've seen advertised here on eBay, it seems as though they may not be the best as far as build quality.
One of mine had problems with the XLR inputs and another one I had had issues with the automatic focusing. I did a lot of research before making my purchase of the cameras originally and I still stand by my decision, but I would warn against buying one without any kind of warranty.
Also, if you do buy a used one, check to see what kind of tapes have been run through it in the past. Some tapes such as Sony use a wet lubricant while others such as Panosonic use a dry lubricant. I've hear that if you use one for an extended period of time and then switch to another without any kind of head cleaning along the way, the two lubricants can mix, cause a chemical reaction and gum up the system.
And last...don't bother buying one of the anamorphic lens'. I've used them on two different cameras and the picture quality didn't increase any significant amount that was noticed by my editors as well as myself and the inaccuracy of the way it is attached (you eyeball it when you screw it on) makes it hard to line it up perfectly.
Bottom line... Get one with a warranty or at least an inspection period. Check to see what brand of tapes have been run through it. Save your money and don't buy the anamorphic lens. And last, but not least, I agree with another one of the reviewers...beware of purchasing one new or used through a Brooklyn dealer as I've seen quite a bit of junk come out of those places.
I use this camera for my work as a videographer multiple times a week and havent found a better camera for my money. Im in the process of buying another one know.