I can’t speak to the other cameras, but I own a 100A and have been very pleased with it. As someone who cut his teeth on Panasonic 1st generation MII product, I swore I’d never own anything from them again. Well, now I do.
You should know the DVX is manufactured by the professional broadcast division of Panasonic. I’ve traveled w/the DVX across country and have shot a majority of my stuff outside. No problems to report.
Is the transport and the inners of the unit small? You bet. Are they prone to unreasonable failure? Define unreasonable.
There are sooooo many variables (original condition, care by previous owners, etc.)it’s difficult to answer.
I will say, having been an avid reader of various forums regarding the DVX, I’ve yet to hear anyone complain about the durability of the DVX.
That’s one of the reasons I bought it.
Good luck,
Tim