I actually have a not-that-far-from-complete run of Marvel Tales because I'm a cheapskate and they provide an inexpensive way to get Silver Age Spider-Man tales as single issue "floppies", printed on newsprint, which is how I like to read them, as opposed to buying modern trade collections.

I agree with Icctrombone that, actually, sometimes the new covers that Marvel put on these reprints were better than the originals. Not often, admittedly, but that was definitely the case on occasion. I'm off out to my Mum's just now, but perhaps I'll post some examples of what I mean a bit later on. Sometimes Marvel Tales utilized the original covers, but doctored them slightly, such flipping them like a mirror image or recolouring them, which was kind of interesting -- especially in the '80s when you'd get old Silver Age covers coloured in the more day-glo palette of the times.

Something else that the '70s and '80s Marvel Tales reprints had over the original comics was that often the printing process and/or printing technology had improved so that, actually, the interior art looked better in the reprint than it did in the original. A friend of mine has some original issues of Amazing Spider-Man from the Lee/Romita era and we compared my copies of those same stories from the early '70s in Marvel Tales and, yeah, the improvement in printing quality is very noticeable.