If you get the right one at the right brice it could be the best investment you ever made, Newman daytonas were not popular as far as i know when first released, bond subes were nothing special either, but look what they command now!
Yes most of the time, but there have been some that have astounded with the quality like the first steelfishes, also on a value for money, what other "swiss" (if you are lucky) powered, stainless steel, saphhire crystaled watch can you buy on the high street for rep prices,$300-400, Not a lot!
it is just the quality control that lets them down most of the time.