I have about 9 of Roman's DVD's. They are very handy to have around if you can't sleep! I also have Seirawan's Chess Mentor DVD, which is actually pretty good. Seriously, stay away from the Roman's Lab stuff. I got the same advice several years ago, and tried my luck anyway...save your money.
I've thought about the Polgar series as well. Waiting to hear some feedback from anyone who actually gets them first. Yes, the Seirawan one is very old. He released it years ago on VHS, and it was converted to DVD format years later. His style of teaching is good though, even though the technology is old. The info is timeless, so it has value, and you can probably get it really cheap on e-bay because of how old it is.
http://www.chesshouse.com/chess_dvd_s/4.htm
I personally like the
Improve Your Chess Series (we bought 4 of them: Endgames, Calculation, Positional Insperation, Attacking With Confidence) and while the are relitivly boring, they provide some extremely useful insight.
Also, (even though I only have boughten 1 thus far) The Foxy Opening Series is good if you have a particular opening you wish to work on.
That's the last one, as far as I know there's 3 in total. I've got the 1st one, which was good (well what I've watched of it) did have a panic though, cos the 1st 48vids on the disc are in german😀
Thankfully there's also the English version on the disc as well.